A car of 900 kg mass is moving at the velocity of 60 km/hr. It is brought into rest at 50 meter distance by applying a brake. Now, calculate the force required to stop the car.
Answers
Answer: \(-2502N\)
Explanation:
\((V_2)^2=(V_1)^2+2ad\)
where;
\(V_2\) = final velocity = 0
\(V_1\) = initial velocity = 60 km/h = 16.67 m/s
\(a\) = acceleration
\(d\) = distance
First all of, because acceleration is given in m/s and not km/h, you need to convert 60km/h to m/s. Our conversion factors here are 1km = 1000m and 1h = 3600s
\(60km/h(\frac{1000m}{1km} )(\frac{1h}{3600s} )=16.67m/s\)
Solve for a;
\((V_2)^2=(V_1)^2+2ad\)
Begin by subtracting \((V_1)^2\)
\((V_2)^2-(V_1)^2=2ad\)
Divide by 2d
\(\frac{(V_2)^2-(V_1)^2}{2d} =a\)
Now plug in your values:
\(a=\frac{(0)^2-(16.67 m/s)^2}{2(50m)}\)
\(a=\frac{0-277.89m^2/s^2}{100m}\)
\(a=-2.78m/s\)
If you're wondering why I calculated acceleration first is because in order to find force, we need 2 things: mass and acceleration.
\(F=ma\)
m = mass = 900kg
a = acceleration = -2.78m/s
\(F=(900kg)(-2.78m/s)\\F=-2502N\)
It's negative because the force has to be applied in the opposite direction that the car is moving.
Related Questions
2. A child swings back and forth on a swing with no friction or air resistance between points X and Z, as shown. Point Y is the lowest point in the swing, where height is zero. Which of the following is equal to the kinetic energy of the child at point Y?
(A) The kinetic energy of the child at point X.
(B) The kinetic energy of the child at point Z.
(C) The potential energy of the child at point Y.
(D) The potential energy of the child at point Z.
Answers
Answer:
c
Explanation:
The refractive index of water is 1.33
and that of diamond is 2.42. Draw a labelled diagram to show how a light ray bends when it travels from water
into diamond.
Answers
Explanation:
light travel slower in daimond
Who conducted the experiment that showed that atoms were mostly made up of empty space?.
Answers
Rutherford conducted the experiment that showed that atoms were mostly made up of empty space.
Rutherford done an experiment in which he allowed alpha particle to bombard on gold foil . Which shows that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. Based on these results, Rutherford proposed the nuclear model of the atom.
The observations made by Rutherford led him to conclude that: A major fraction of the α-particles bombarded towards the gold sheet passed through the sheet without any deflection, and hence most of the space in an atom is empty.
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An electromagnet is a device that uses an electric current to produce a magnetic field.
Electromagnets are typically composed of a piece of metal wrapped with wire and connected to a battery. The battery provides the electric current, and the loops or coils of wire enhance the magnetic field. The more loops there are, the stronger the magnetic field.
When electric current flows through the electromagnet, the metal core becomes magnetized, so it possesses a north pole and a south pole.
Motors place electromagnets inside of permanent magnets as shown below.
However, motors are designed so that the polarity of the electromagnet constantly flips. That is, the north pole becomes the south pole, and the south pole becomes the north pole, every time the electromagnet turns 180 degrees.
Why is it designed this way?
A.
to conserve the energy in the battery
B.
to constantly polarize the field magnet
C.
so the electromagnet will continuously turn
D.
so the magnetic field will get stronger
Answers
The reason why motors are designed so that the polarity of the electromagnet constantly flips.is
C. so the electromagnet will continuously turn
Why is motor designed that wayThe reason motors are designed so that the polarity of the electromagnet constantly flips is to continuously turn the electromagnet. This allows the motor to rotate continuously, rather than becoming stuck in one position.
The flipping of the polarity causes the electromagnet to attract and repel from the permanent magnets, creating a rotating motion.
Therefore, the correct answer is C.
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a dog lifts a 0.75 kg bone straight up through a distance of 0.11 m. How much work was done by the dog ?
Answers
The work done by the dog is 0.81J.
What is work done?Work done is a measure of energy expended in moving an object; most commonly calculated by multiplying the force by the distance.
It is said that no work is done if the object does not move.
The work done on an object is the amount of energy transferred to an object through work.
According to this question, a dog lifts a 0.75 kg bone straight up through a distance of 0.11 m. The force applied to break the bone must be calculated first as follows:
Force = mass × acceleration
Force = 0.75kg × 9.8m/s²
Force = 7.35N
Work done = 7.35N × 0.11m = 0.81J
Therefore, 0.81J is the work done by the dog.
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A motorist is speeding along at 33m/s when he sees a squirrel on the road 200 meters in
front of him. He tries to stop, but it takes 12 seconds for his car to stop
(a) What is the acceleration of the car? (assume acceleration was constant)
(b) Does the squirrel survive?
(c) How fast was the car moving at 100 meters?
Answers
a) the acceleration of the car = -2.75 m/s
b) d = 198 meters. Therefore, the squirrel would survive.
c) the car moving at 100 meters with a speed of 23.22m/s
What is acceleration ?
acceleration: the rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. Both effects contribute to the acceleration for all other motions.
Use the kinematic equation to solve for the acceleration:
v = u +at
v = final velocity
u = initial velocity
a = acceleration
t = time
In this instance, the final velocity is 0 because he comes to a stop. We can solve for the acceleration by plugging in the given values:
0 = 33 + (12)a
0 = 33 + 12a
-33 = 12a
-33 / 12 = a --> a = -2.75 m/s²
b) Find the amount of distance necessary to stop. Use the formula:
v^2 = u^2 + 2ad
d = distance
Plug in the values:
0² = 33² + 2(-2.75 · d)
0 = 1089 - 5.5d
-1089 = -5.5d
d = 198 meters. Therefore, the squirrel would survive.
c)
Find the velocity at 100 meters by using the same formula as before:
v^2 = u^2 + 2ad
However, in this instance, we are solving for the final velocity. Plug in the given points to solve:
vf² = 33² + 2(-2.75 · 100)
vf² = 1089 + (-550)
vf² = 539
vf = √539
vf ≈ 23.22 m/s.
the car moving at 100 meters with a speed of 23.22m/s
a) the acceleration of the car = -2.75 m/s
b) d = 198 meters. Therefore, the squirrel would survive.
c) the car moving at 100 meters with a speed of 23.22m/s
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A tuning fork vibrating in water with a frequency of 840 Hz produces waves that are 2.5 m long. If a tuning fork vibrating at 500 Hz produces the same type of wave in water, what will the wavelength of the waves be?
A) 1.5 m
B) 4.2 m
C) 3.2 m
D) 2.5 m
Answers
Answer:
Option B
Explanation:
As we know
Frequency (F) * wavelength (W) = C (speed of light - can also be taken as constant)
Hence,
\(F1 W1 = C\\F2W2 = C\)
Or \(F1W1 = F2W2\)
Substituting the given values, we get -
\(840 *2.5 = 500 *XX = 4.2\) m
Hence, option B is correct
when high voltages are present, a glow may be seen around sharp points, known as
Answers
When high voltages are present, a glow may be seen around sharp points, known as corona discharge.
This glow is caused by the ionization of the air molecules near the sharp point due to the electric field strength. The ionized air molecules emit light, creating a visible glow. The intensity and color of the glow depend on the voltage level and the gas composition of the surrounding environment.
Corona discharge is a phenomenon that occurs when high voltages are applied to a conductor, especially in the presence of a sharp point or a high electric field. It results in the ionization and excitation of the surrounding air molecules, creating a glowing or visible aura of light around the conductor. The ionized air can also produce a hissing or crackling sound. Corona discharge is often observed in high-voltage power lines, antennas, and other high-voltage equipment. It is important to note that corona discharge can cause power loss and interfere with the proper functioning of electrical systems, so efforts are made to minimize its occurrence in high-voltage applications.
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A satellite in orbit around Earth is in uniform circular motion. What is the angle between the velocity vector and acceleration vector at any given point on the orbit?
A. 90°
B. 45°
C. 180°
D. 0°
Answers
The angle between the velocity vector and acceleration vector at any given point in the orbit would be 90 degrees, therefore the correct answer is option A.
What is acceleration?The rate of change of the velocity with respect to time is known as the acceleration of the object. Generally, the unit of acceleration is considered as meter/seconds².
As given in the If a satellite in orbit around Earth is in a uniform circular motion then we have to find the angle between the velocity vector and acceleration vector.
In a uniform circular motion, the angle between the velocity vector and acceleration vector is always π/2.
The angle between the velocity vector and acceleration vector at any given point in the orbit would be 90 degrees.
Thus, the correct answer is option A.
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Obtain a separate interval estimate of β' for each region. Use a 90 percent confidence coefficient in each case. Do the regression lines for the different regions appear to have similar slopes?
Answers
To obtain a separate interval estimate of β' for each region, Use a 90 percent coefficient in each case. The regression lines for the different regions appear to have similar slopes is 10%.
Firstly, we have to partition the data into the regions. Then we can carry out separate regressions for each region. We can use the t-distribution for finding the critical values. For each region, we can find the critical t-value using the formula given below:tcrit= t(α/2, n - 2)where α = 0.10 and n is the number of observations in that region. Once we have found the critical value, we can use it to calculate the confidence interval for the slope β'. The formula for the confidence interval is given below:β' ± tcrit * SE(β')where SE(β') is the standard error of the slope β'.
Once we have obtained the separate confidence intervals for each region, we can compare them to check if the regression lines for the different regions appear to have similar slopes. If the confidence intervals overlap significantly, then we can conclude that the slopes are not significantly different. Otherwise, we need to investigate further to see if there are any factors that may be causing the difference in slopes.
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pls pls pls help i need to know the correct answer and why it’s correct, thanks in advance
What is the relationship between power, work, and time?
A
As the amount of time increases,
power and work both increase.
B
As the amount of time increases,
power and work both decrease.
С
As the amount of time increases,
power increases and work is not affected. D. As the amount of time increases power decreases and work is not affected.
Answers
Answer:
it's ans is D because all three are wrong
nanosecond and microsecond, which one is greater?
Answers
A microsecond is 0.000 001 second and one thousand times longer than 1 nanosecond, which is 0.000 000 001 second.
Answer:
nanoseconds
Explanation:
micro seconds is commonly represented by a symbol
but nanoseconds is a billionth of a second abbreviation:ns
other quanto
Dalex when
the face
into that one dan
a Explains why fish can
Survive under
Horan
Answers
I'm not sure what you were trying to put here
a boat (with a flat bottom) and its cargo weigh 5,800 n. the area of the boat's bottom is 9 m2. how far below the surface of the water is the boat's bottom when it is floating in water?
Answers
The required height above which boat's bottom floats is 6cm.
The upward force exerted by the liquid opposes the weight of the object immersed in the liquid. The pressure at the bottom of an object immersed in liquid is always greater than at the top. A fluid pressure differential produces a net upward force on an object. This upward force is called lift. To fully understand the concept of buoyancy, we need to understand density and relativity.Buoyancy depends on two important factors.Liquid density.Body volume.Example - A ship is designed to be lifted very high, but has a flat, hollow bottom and is relatively less dense than water. Therefore, the ship displaces as much water as it needs, so it can easily float.
Well buoyancy = weight of displaced water = 5800 N
1 m3 of water has a mass of 1000 kg so weight 1000 x 9.81 = 9810 N
therefore volume of water displaced = 5800 / 9810 m3
44 Required depth = volume/floor area = volume/9 (5800/(9810×9))m=0.06m=6cm
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sam says that beta particles are not used to irradiate food because they make it radioactive. Jo says that the reason is that beta particles would not be able to penetrate all the way through think packages of food. Who is correct, Sam or Jo?
Answers
Answer:
Jo
Explanation:
irradiating food doesn't make it radioactive (that's contamination) and beta particles are stopped by aluminium foil or thin metals, so it may not pass through thick packaging (usually gamma is used to irradiate foods as it can pass through the packaging)
I need chapter one section three
Answers
Using 6. 0×1024 kg for the mass of the earth, what is the acceleration of the earth toward her as she accelerates toward the earth with an acceleration of 9. 8 m/s2 ? assume that the net force on the earth is the force of gravity she exerts on it.
Answers
The value of the acceleration of the earth toward it when it accelerates toward the earth with 9.8m/s² is a = 7.35×10-²³m/s².
What is acceleration?Acceleration is defined as the second derivative of displacement or the derivative of velocity:
a = d/dt(dS/dt) = dV/st.
It is the rate of change of velocity, it generates a constant change over time.
What are forces?Forces are the definition of Newton's second law, which is stated under the relation:
∑ Force = mass × acceleration.
In other words, force is the origin of motion since it generates acceleration in a system.
In this case we must complete the statement:
"A student with mass 45 kg jumps off a high diving board. Using 6. 0×1024 kg for the mass of the earth, what is the acceleration of the earth toward her as she accelerates toward the earth with an acceleration of 9. 8 m/s2 ? assume that the net force on the earth is the force of gravity she exerts on it."
We determine the Force of the student:
F = ma
F = 45kg * 9.8m/s².
F = 441N
Now we go to the acceleration of the earth:
a = F/m
a = 441N / 6×10²⁴ Kg
a = 7.35×10-²³m/s².
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How does an electrical impulse travel through a nerve cell?
Answers
An electrical impulse travel through a nerve cell by dendrites to the cell body.
The fundamental functional unit of the nervous system, the neuron, is in charge of receiving, carrying, and transmitting nerve impulses.
The dendrites of the neurons receive the electrical impulses.
These electrical impulses are sent from the dendrites to the cell body where they originate.
The axon carries the impulses from the cell body to the axonal end after receiving them.
The adult human brain is estimated to have 86 billion nerve cells, also known as neurons, which are the basic functioning components of the nervous system. A nerve cell's function is to receive information from other cells and convey it to other cells. In the human body, there are three basic types of nerve cells that work together to sense and analyze information about our surroundings before evoking reactions to these stimuli.
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A 222 kg snowmobile is traveling at 24.21 m/s. How fast would a 306.3 kg snowmobile need to travel in order to have the same momentum?
Answers
The velocity is 17.5 m/s.
What is the momentum?Momentum is a measure of an object's motion and is defined as the product of its mass and velocity. It is a vector quantity, meaning it has both magnitude and direction.
Momentum of the snowmobile = 222 kg * 24.21 m/s.
= 5374.62 Kgm/s
Velocity of the other snowmobile = 5374.62 Kgm/s/306.3 kg
= 17.5 m/s
Thus we observe that the momentum can be used to obtain the velocity of the object we have here. In physics, momentum is a vector quantity, meaning it has both magnitude and direction.
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a car with a mass of 1,020.0 kg accelerates from 0 to 94.0 km/h in 10.0 s. the driver applies the brakes when the car is moving at 94.0 km/h, and the car comes to rest after traveling 38.0 m. what is the net force (in n) on the car during its deceleration? (assume the car is traveling in the positive direction. indicate the direction with the sign of your answer.)
Answers
The net force on the car during its deceleration = 9139.2 N
What is deceleration?Deceleration is actually inversely related to acceleration. We know that acceleration is the rate at which an object is speeding up, and deceleration is the rate at which an object is slowing down. For example, when you brake while driving, deceleration is used to slow the vehicle.
Given, m= 1020 kg
u= 0 m/s
V = 94 km/h or 26.1 m/s
t = 10 s
For deceleration
u = 26.1 m/s
v = 0
S = 38 m
by equation of motion ;
v² = u² + 2as
0 = 26.1² + 38a
a = - 8.96 m/s²
Net force during deceleration:
F= m*a
F= 1020 × 8.96
F = 9139.2 N
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in The unit of power is a
derived unite
The unit of power is
a derived unit be con
CAY
Answers
Answer:
Watts
Explanation:
The SI unit for power is the watt (W), where 1 watt equals 1 joule/second (1 W=1 J/s).
Question one
Discuss in details hemodynamic dysfunctions 20marks
Answers
Hemodynamic dysfunction refers to disruptions in the normal flow of blood through the body, leading to organ dysfunction and tissue hypoxia. Common types include hypovolemia, hypertension, cardiac dysfunction, pulmonary dysfunction, and vascular dysfunction. Identifying and treating the underlying cause is crucial for optimal patient outcomes.
Hemodynamic dysfunction refers to a disruption in the normal flow of blood through the body due to a variety of factors. Hemodynamic dysfunction can cause organ dysfunction, tissue hypoxia, and other problems.
Some of the common types of hemodynamic dysfunction:
1. Hypovolemia: A decrease in blood volume causes hypovolemia. Hypovolemia can be caused by a variety of factors, including bleeding, dehydration, and severe burns. Hypovolemia results in low blood pressure, decreased cardiac output, and decreased tissue perfusion.
2. Hypertension: Hypertension is a condition characterized by high blood pressure. It can result in damage to the heart, kidneys, and other organs over time. Hypertension can cause hemodynamic dysfunction by altering the normal flow of blood through the body.
3. Cardiac dysfunction: Heart failure, cardiogenic shock, and other forms of cardiac dysfunction can all cause hemodynamic dysfunction. Cardiac dysfunction can cause decreased cardiac output and tissue hypoxia.
4. Pulmonary dysfunction: Pulmonary hypertension and other pulmonary diseases can cause hemodynamic dysfunction. Pulmonary dysfunction can cause changes in pulmonary vascular resistance and pressure, which can affect the normal flow of blood through the body.
5. Vascular dysfunction: Vascular diseases such as atherosclerosis, vasculitis, and peripheral artery disease can cause hemodynamic dysfunction. Vascular dysfunction can cause changes in vascular resistance and pressure, which can affect the normal flow of blood through the body.
In conclusion, hemodynamic dysfunction is a complex phenomenon that can be caused by a variety of factors. It can result in organ dysfunction, tissue hypoxia, and other problems. Identifying and treating the underlying cause of hemodynamic dysfunction is critical for ensuring optimal patient outcomes.
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An experiment was set up to investigate the cooling of water in two flasks. One flasks was painted shiny white. The other was painted Matt black. The starting temperature of the hot water poured into both flasks was 80 degrees. Explain what other quantity had to be kept the same in both flasks to make the experiment fair.
Answers
Answer:
add add more hot water in the flask painted shiny white while less of it in the one painted Matt black
Explanation:
Let's name the flasks A and B respectively
flask A due to the nature of its exterior will tend to reflect heat from the environment thus will need more hot water while flask B since it painted in Matt black the heat will be absorbed from the environment thus will require less hot water
Calculate the change in time for each quarter of the track. Record the change in time in Table C of your Student Guide
Answers
Answer:4 and 5
Explanation:it you add 1+3 and 2+3 it is 4 and 5
You are pulling on a rope attached to the outer radius of a pulley with a moment of inertia I = 2.85 kg-m^2 as shown. The tension force of you on the pulley is 266.3 N. A pack of mass 23.4 kg is attached to the pulley's inner radius as shown. If the inner radius of the pulley is 0.43 m and the outer radius is 0.66 m, what is the magnitude of the linear acceleration of the pack? If instead of using a pulley with two radii, you were to replace the two radii pulley with a simple pulley of one radius: how would using the simple pulley instead of the two radii pulley affect the difficulty of holding the pack at rest over the edge? It will be easier to hold the pack. Not enough information to tell. There will be no difference. It will be harder to hold the pack.
Answers
The magnitude of the linear acceleration of the pack can be calculated using the following equation:a = (T - Fr) /m where a is the magnitude of the linear acceleration of the pack,T is the tension force of you on the pulley,Fr is the frictional force, and m is the mass of the pack.Substitute the given values to the formula:a = (T - Fr) / ma = (266.3 - Fr) / 23.4.
The frictional force can be determined using the moment of inertia of the pulley.I = mr²I = 2.85 kg-m²m = I / r²m = 2.85 / 0.43²m = 15.57 kgFr = maFr = 15.57 × aa = (266.3 - 15.57a) / 23.4Solve for a by multiplying both sides by 23.4:23.4a = 266.3 - 15.57a23.4a + 15.57a = 266.3a = 266.3 / 39.97a = 6.66 m/s².
Therefore, the magnitude of the linear acceleration of the pack is 6.66 m/s².If instead of using a pulley with two radii, you were to replace the two radii pulley with a simple pulley of one radius, it will be harder to hold the pack.
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In beams with circular cross sections, transverse shear stress acts parallel to the y axis over the entire depth of the shape.
a. true
b. false
Answers
The given statement is that in beams with circular cross-sections, transverse shear stress acts parallel to the y axis over the entire depth of the shape.
The tension that develops as a result of the internal shearing of a beam as a result of a shear force applied to the beam is known as shearing stress.
One-half of the difference between the primary stresses is the maximum shear stress. It should be noticed that the primary planes equation, 2p, results in two angles between 0° and 360°.
The primary stresses brought on by bending are typical tension and compression stresses. However, the state of stress within the beam also includes large normal stresses caused by bending in addition to shear stresses caused by the shear force, even though the former is often of a lesser order than the latter.
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Changes of weather before a typhoon
right answer = brainliest
nonsense = report subject: science
sub to : ~uni scent~ on
yt
for
tutorials
and
videos
bye!
Answers
Overcast and ominous sky windy conditions and a lot of rain. along the shore, large waves. storm swells are some of the weather changes before typhoon.
The weather during a typhoon may be described in what way?Tropical cyclones, often known as hurricanes or typhoons, are powerful circular storms that form over warm tropical waters and are distinguished by low air pressure, strong winds, and torrential rain.
Before the storm hits, what changes to the sky?Storm precursors start to show up. The ocean surf is around 4m (13 feet) in height and is coming in 7 seconds apart. The barometer is dipping slightly, the wind is blowing at 18–20 kmph. Large, white cirrus clouds may be seen gathering over the horizon. The horizon is gradually being engulfed by the approaching cloud cover.
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1 The speeds of a car travelling on a straight road are given below at successive intervals of 1 second. Time/s Speed/m/s 0 0 1 2 2 4 3 6 4 8 Calculate a the average speed of the car in m/s b the distance the car travels in 4s c the constant acceleration of the car. 2 If a train travelling at 10 m/s starts to accelerate at 1 m/s2 for 15s on a straight track, calculate its final speed in m/s.
Answers
The average speed = 2 m/ s
The distance traveled in 4s is 16m
the constant acceleration is
2. the final speed is 25 m/s
How to solve for the valuesAverage speed = distance / time
= 2 + 4 + 6 + 8 / 1 + 2 + 3 + 4
= 20 / 10
= 2
The distance in 4s:
we would solve using the formula
ut + 1/2at^2
0 + 1/2 * 2 * 4^2
= 16 meters
2. If the train is at 10 m /s for 15 s, we would use the formula
v = u + at
u = 10
a = 1
t = 15
then
v= 10 + 1× 15
=v= 25 m/ sec
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While skydiving you are trained to deploy your primary canopy at an altitude of 5,500 feet above the ground. At the time of the deployment your velocity is equal to terminal velocity, 134mph. Your mass, prior to jumping, was 178 pounds with all your gear. It takes you exactly 76 seconds to touch the ground, what was the force of wind resistance from the parachute?
Answers
The force of wind resistance from the parachute is approximately 15.29 pounds.
What was the force of wind resistance from the parachute?Generally, We can solve this problem using the work-energy principle, which states that the work done on an object is equal to the change in its kinetic energy. At the instant the parachute is deployed, the skydiver's kinetic energy is given by:
K1 = (1/2)mv1^2
where m is the mass of the skydiver and gear, and v1 is the terminal velocity of 134 mph (which we convert to feet per second by multiplying by 1.47).
K1 = (1/2)(178 lb + gear)(134 mph x 1.47 ft/s/mph)^2
= 84,080 ft-lb
At the moment the skydiver touches the ground, their kinetic energy is zero, so the work done by the wind resistance from the parachute is equal to K1. The work done by a force is given by:
W = Fd
where F is the force, and d is the distance over which the force acts. In this case, the force is the wind resistance from the parachute, and the distance is the distance traveled by the skydiver from the deployment altitude of 5,500 feet to the ground.
d = 5,500 ft
So we can solve for the force as:
F = K1 / d
= 84,080 ft-lb / 5,500 ft
= 15.29 lb
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where would information on the chemical and physical properties of a specific chemical be located in a laboratory or in the workplace?
Answers
Answer:
on the body of the container of the chemical and it also on the shelf where the chemical is kept in the laboratory.
Explanation:
The information on the chemical and physical properties of a specific chemical should be located on the body of the container of the chemical. when storing chemicals in a laboratory the properties, both chemical and physical properties of the chemical should be written out and pasted on the body of the container that contains the chemicals.and also o the shelf where the chemical is kept in the laboratory or workplace .