A boat moves with a velocity of 15 m/s, n in a river which flows with a velocity of 8. 0 m/s, west. Calculate the boat's resultant velocity with respect to due north.
Answers
The boat's overall speed, measured in m/s north-west, is the outcome. The boat's final speed in relation to the North is therefore 17
What are velocity and speed?In contrast to velocity, which describes the direction of travel of an object's movement, speed is the rate of movement along a path. Alternatively, velocity is a vector while speed is a scalar quantity.
How are speed measurements made?Velocity (v), which can be expressed by the equation v = s/t, is a vector number that measures dispersion (or change in position, s), over change in time (t). Speed (or rate, r) is a vector value that represents the amount of distance traveled (d) over the amount of time changed (t), as shown by the equation r = d/t.
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Related Questions
Water waves in a small tank are 6.6 m long. They travel at a speed of 2.9 m/s. What is the frequency of the water
waves?
Answers
Answer:
.439 Hz
Explanation:
Wavelength = 6.6 m
speed = 2.9 m/s
2.9 = 6.6 f
f = 2.9/6.6 = .439 Hz
A relative asks your advice about a skin cream that reduces oxidation of
the lower skin layers and, thereby, reduces skin aging. Explain to her the
effectiveness of the skin cream based on that claim.
?
Answers
Answer:
Hmm
Explanation:
Answer:
Are antioxidant-rich skincare products as effective as they say they are? Best Health checked the science behind the claims.
Rusting iron and the browning flesh of an avocado both have something in common with the discoloration, wrinkles and fine lines of our aging skin: oxidation. Antioxidants counter this natural aging process, and that’s why they have been taking top billing in skin care.
Explanation:
1. What is the kinetic Energy of a 1500kg object moving at 21 m/s?
2. A cat decides to jump down from the top of a bookshelf. It has 68 J of mechanical energy and 19 J of gravitational potential energy. What is the kinetic energy of the cat?
3. What is the kinetic energy of a 423 kg object moving at 14 m/s?
please i needed for grade
Answers
=122
KE = kinetic energy
m = mass of a body
v = velocity of a body
kinetic energy (KE) is equal to half of an object's mass (1/2*m) multiplied by the velocity squared. For example, if a an object with a mass of 10 kg (m = 10 kg) is moving at a velocity of 5 meters per second (v = 5 m/s), the kinetic energy is equal to 125 Joules, or (1/2 * 10 kg) * 5 m/s2.
For the first one I think :
Answer:
KE = 330750 J
I’m not sure about the second one- sorry
The third is
Answer:
KE = 41454 J
Hope it helps and it is correct, sorry if it isn’t !
assume that you come in contact with a 120 v electrical circuit. the current (in milliamps) with the above voltage through wet (contact resistance of 1,000 ohms) hands is:
Answers
The current through wet hands when in contact with a 120 V electrical circuit would be 120 milliamps (mA).
Voltage (V) = 120 V
Resistance (R) = 1,000 ohms
According to Ohm's law, the voltage across two places is precisely proportional to the current flowing through a conductor between them. According to Ohm's Law, we can compute the electrical current in a circuit by dividing the voltage by the resistance. If the resistance is reduced, the current will alter.
Calculating the current by using Ohm's law -
I = V / R
Substituting the values:
I = 120 / 1,000
= 0.12 A
Converting 0.12 A to milliamps by multiplying by 1,000 -
= 0.12 x 1,000
= 120
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PLEASE HELP ME!
Look at the periodic table and answer these questions:
1. Which elements are in the same group?
O and Te
O and F
O and He
2. Which elements are in the same period?
O and Te
O and F
O and He
I WILL GIVE YOU 50 POINTS IF YOU GIVE ME THE RIGHT ANSWER!!
Answers
For number 2, the answer is O and F. The reasoning is because Period means the horizontal (left to right) row.
A rocket ship is moving through space at 1200 m/s. The rocket ship accelerates at a rate of 4 m/s in the same direction. What is the rocket ship's speed after 200 seconds of acceleration?
Answers
Answer:
Vf = 2000 [m/s]
Explanation:
To solve this problem we must use the following equation of kinematics.
\(v_{f} =v_{o}+a*t\\\)
where:
Vf = final velocity [m/s]
Vo = initial velocity = 1200 [m/s]
a = acceleration = 4 [m/s]
t = 200 [s]
Vf = 1200 + (4*200)
Vf = 1200 + 800
Vf = 2000 [m/s]
One of the discoveries which led to the modern view of the solar system was that the orbits of the planets are?
Answers
Which type of electromagnetic radiation is most likely to be ionizing
radiation?
OA. Microwaves
OB. Xrays
OC. Radio
D. Visible light
Answers
Answer:it is c i just did it and got it right. :3
Explanation:
determine the electrical conductivity of a cu-ni alloy that has a yield strength of 140 mpa.
Answers
Copper-nickel (Cu-Ni) alloys are high-strength and corrosion-resistant alloys that are used in a wide range of applications, including electrical applications. The electrical conductivity of a Cu-Ni alloy is dependent on a variety of factors, including the alloy composition, temperature, and mechanical properties, such as the yield strength.A Cu-Ni alloy that has a yield strength of 140 MPa may have a different electrical conductivity compared to another Cu-Ni alloy that has a different yield strength.
However, in general, Cu-Ni alloys are known for their high electrical conductivity, with electrical conductivity values ranging from 7 to 45% International Annealed Copper Standard (IACS).Cu-Ni alloys have excellent electrical conductivity because copper is an excellent conductor of electricity, while nickel improves the alloy's resistance to corrosion and oxidation. Additionally, Cu-Ni alloys have good thermal conductivity, making them useful in applications where heat transfer is necessary. Overall, determining the electrical conductivity of a Cu-Ni alloy requires an understanding of the specific alloy's composition, temperature, and mechanical properties. However, in general, Cu-Ni alloys are known for their high electrical conductivity and are used in many electrical applications.
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what is the formula for finding the velocity?
Answers
Answer:
v = Δs/Δt
and use this calcultor"Velocity Calculator | Definition | Formula - Omni Calculator"if u have problems to slove.cos
Explanation:
is described as the sum of all the individual resistances in a series.1) Equivalent resistance2) Parallel circuit3) Series circuit4) Short circuit
Answers
The sum of all resistances in the series circuit is known as Equivalent resistance.
\(R=r_1+r_2+.\ldots.r_n\)where R is the equivalent resistance.
Hence, option 1 is the correct answer.
The phase Ø of light of wavelength λ travelling through a shifter with refraction index n is given by Øs = 2πntλ-1, where t is the shifter thickness. The phase of the same light wave travelling through air for a distance equal to t is Øa= 2ntλ-1. Derive an expression for the thickness of the shifter as a function of λ and n in order to obtain a phase shift of 180°.
Answers
The thickness of the shifter is given as t = λ / 2n.
The given equation of the phase of light of wavelength λ traveling through a shifter with a refractive index n is given by: Øs = 2πntλ-1, where t is the thickness of the shifter.
The phase of the same light wave traveling through air for a distance equal to t is Øa= 2ntλ-1.
We are supposed to derive an expression for the thickness of the shifter as a function of λ and n to get a phase shift of 180°.
Given, The phase of light of wavelength λ traveling through a shifter with a refractive index n is given by: Øs = 2πntλ-1
The phase of the same light wave traveling through air for a distance equal to t is Øa = 2ntλ-1
To obtain a phase shift of 180°, we have: Øs - Øa = πi where i is an integer.
Substituting the value of Øs and Øa in the above expression, we have:
2πntλ-1 - 2ntλ-1 = πi2πntλ-1 - 2ntλ-1
= π(2nλt) / λ2πntλ-1
= 2nλt / λπt
= λ / 2n
Hence, the thickness of the shifter is given as t = λ / 2n.
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The net force on an object moving with constant speed in circular motion is in which direction
Answers
Answer:
the net force is the same direction as the acceleration
Explanation:
so toward the center of the circle about which the object is constantly moving.
What is the temperature increase of 4.0 kg of water when it is heated by
Q= 4.80 * 10^5 J? (cp= 4186 J/kg C
Answers
Answer:
ΔT = 28.667°C is the answer.
Explanation:
Given, Mass of water = 4.0 kg
Water is heated by = 8 × 10² W = 800 W
Time = 10 min = 10 × 60 = 600 s
Now, using the equation of specific heat,
Q = mcΔT
where c is the specific heat capacity of water = 4186 J/kg°C
Q = Pt
Substituting,
Pt = mcΔT
800 × 600 = 4 × 4186 × ΔT
480000 = 16744 × ΔT
ΔT = 28.667
Temperature increased, ΔT = 28.667°C
Most of the galaxies in the universe are observed to be moving away from Earth. Suppose a particular galaxy emits orange light with a frequency of 5.000 x 10 Hz. Part A If the galaxy is receding from Earth with a speed of 4500 km/s, what is the frequency of the light when it reaches Earth? Express your answer to four significant figures and include appropriate units.
Answers
The frequency of light when it reaches Earth is approximately 4.988 x 10^14 Hz.
Explanation:-
Given:
Emitted frequency of light, f = 5.000 x 10^14 Hz,
Speed of the galaxy receding from Earth, v_src = 4500 km/s.
We need to convert the speed of the galaxy from km/s to m/s:
v_src = 4500 km/s * (1000 m/km)
v_src = 4.5 x 10^6 m/s
Plugging the given values into the Doppler effect formula:
f' = (5.000 x 10^14 Hz) * (3.00 x 10^8 m/s + 0 m/s) / (3.00 x 10^8 m/s + 4.5 x 10^6 m/s)
Simplifying the expression:
f' = (5.000 x 10^14 Hz) * (3.00 x 10^8 m/s) / (3.00 x 10^8 m/s + 4.5 x 10^6 m/s)
f' ≈ 4.988 x 10^14 Hz
Therefore, the frequency of light when it reaches Earth is approximately 4.988 x 10^14 Hz.
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10 points!!!!!!! quick pls
Answers
Answer:
The first answer is in the picture
b. The box will move foward
PLEASE MARK BRAINLIEST
OMEWORK EXERCISE: DESIGNING AN INVESTIGATION USING SCIENTIFIC METHOD:
Observation: Mrs. Ntuli has two different kinds of pots in her kitchen. The food always seems to
cook quicker when she uses the aluminum pots than when she uses the enamel pots.
Write a scientific report with the following headings:
• Hypothesis
Aim
Apparatus
Variables
Method
Results (including a suitable graph)
Conclusion
Evaluation
Answers
Answer:
Aim: To investigate which material of pot will cook food quicker.
Hypothesis: The (aluminum/enamel) pots will cook the food quicker than the (aluminum/enamel) pots.
Apparatus:
- Aluminum pots
- Enamel pots
- Stove top
Variables:
Independent variable (What will be changed) - Material of pot
Dependent variable (What's being measured) - Time taken for food to cook
Controlled variables (What's staying the same) - Size of pot, type of food being cooked, quantity of food being cooked, stove top
Method:
Place aluminum pot on stove top and turn on stove topCook your chosen food in the potRecord time taken for food to cookRepeat steps 1-3 another 2 timesPlace enamel pot on stove top and turn on stove topCook chosen food in the potRecord time taken to cookRepeat steps 5-7 another 2 timesResults: (I don't have results because i never conducted this experiment)
Conclusion: This experiment showed that (aluminum/enamel) pots cooked the food quicker than (aluminum/enamel pots). These results (supported/rejected) my hypothesis.
Evaluation: (Never did the experiment, so there's nothing to evaluate)
Explanation:
I hope this helps :)
Write 5 advantages of electricity.
Answers
Answer:
Quick, Efficient, Reliable, Safe and Continous
Answer:
Five advantages of electricity are :Advantages
It is transportable over long distances
It is silent
It can be used produce magnetic fields, which can be used to propel motors
It is very transformable
It is very fast, virtually the speed of light
It can be used to produce other forms of radiant energy, such as radio waves, microwaves, radiant heat and light
I’ll literlly give you points
and make you brainiest
Answers
Answer:
a
Explanation:
what would be the noontime altitude of the sun at the time of the summer solstice?
Answers
At the time of the summer solstice, the noontime altitude of the sun is at its highest point, around 90°.
What is altitude?Altitude is the height above sea level. It is typically measured in either metres or feet. In aviation, altitude can also refer to the vertical distance between an aircraft and a certain reference point on the ground. Altitude can be used to determine the air pressure, temperature, and density of the air. Altitude can also be used to calculate the distance a plane can travel without refueling. Altitude can play an important role in the weather of an area, as air pressure and temperature tend to decrease with altitude. Altitude can also affect the type of vegetation found in an area. In mountain regions, the altitude can have a dramatic effect on the climate, creating distinct areas of vegetation and wildlife. Altitude can also affect the types of crops that can be grown in an area, depending on the air pressure, temperature, and precipitation.
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What has a definite volume definite shape and are rigid?
Answers
Answer:
Explanation:
Answer is solids
Solids have definite shape and volume.
Liquids do not have shape but have volume. The take the shape of the container.
Gases do not have shape nor volume.
22.What factor determines in the direction of heat flow between objects?Select one:a. The difference in density of the objects. b. The difference in mass of the objects.c. The difference in temperature of the objects. d. The difference in size of the objects.
Answers
We will have that the factor that determines the direction of the heat flow between objects is the difference in temperature.
Physics Trajectory question.
I need help finding the answers on Vy.
Answers
The vertical component of the velocity after the given interval of time will be:
B: -9.8 m/s
D: -19.6 m/s
F: -29.4 m/s
H: -39.2 m/s
What is a projectile?A projectile can be described as any object upon which the only force is gravity. The projectile travels with a parabolic trajectory because of the influence of gravity. No horizontal forces are acting upon projectiles so there is no horizontal acceleration.
The horizontal velocity of a projectile is constant and the vertical acceleration is caused by gravity. The vertical component of the velocity of a projectile changes by 9.8 m/s each second while the horizontal motion of a projectile is independent of its vertical motion.
Given, the initial horizontal velocity, vₓ = 18 m/s
The initial vertical velocity, Vy = 0 m/s
The time interval = 1 sec
The vertical component of the velocity is calculated as;
\(V_y = V_{0y} -gt\)
\(V_y = 0- (9.8) (1)\\V_y = -9.8 m/s\)
The vertical component when t = 2 sec and horizontal velocity, Vx = 18 m/s
\(V_y = 0- (9.8) (2)\\V_y = -19.6 m/s\)
The vertical component of velocity when t = 3sec:
\(V_y = 0- (9.8) (3)\\V_y = -29.4 m/s\)
The vertical component of velocity when t = 4sec:
\(V_y = 0- (9.8) (4)\\V_y = -39.2 m/s\)
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A
heat engine is measured to have 30% efficiency. Is the theoretical
efficiency going to be greater or less than that? Why?
Answers
The theoretical efficiency is greater than that of the actual efficiency of the engine. This is because heat engine always produces some waste heat.
The Second Law of Thermodynamics states that a heat engine cannot be 100% efficient. In practice, a heat engine is only 100% efficient when it is operating at about 30-50% efficiency.
If we were to multiply this by 100, we would get the efficiency as a percent: 49%. This is the theoretical maximum efficiency. If we were to actually build an engine, it would be less efficient than the theoretical engine. The theoretical engine that can achieve this theoretical maximum efficiency is called the Carnot Engine.
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A spring-loaded ballistic cart measuring 0.5 kg is in contact with a second 0.8 kg cart. The carts are
initially at rest on a level surface. The spring is released and the lighter cart is observed to move at +0.4
m/s afterward. What is the velocity of the other cart?
Answers
A spring-loaded ballistic cart is in contact with a second cart. The velocity of the other cart is 0.25 m/s.
What is the conservation of linear momentum?When there is no external force acting on the system, the initial momentum is equal to the final momentum.
Momentum is equal to the product of mass and its velocity.
According to the conservation of linear momentum,
m₁v₁ +m₂v₂ = m₁u₁ +m₂u₂
u and v represents the initial and final velocity. 1 and 2 represents the first and second cart.
Given is m₁ = 0.5 kg, m₂ =0.8kg, u₁ =u₂ =0 m/s and v₁ = 0.4 m/s.
Substituting the values in the conservation of momentum equation, we get the velocity of second cart is
0.5 x 0.4 + 0.8 x v₂ = 0.5 x 0 + 0.8 x 0
v₂ = +0.25 m/s (in the direction of first cart)
Thus, the velocity of the other cart is 0.25 m/s.
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Which city is known as the richest square mile on earth?.
Answers
Answer:
Central City is the county seat and the most populous municipality of Gilpin County. The city is a historic mining settlement founded in 1859 during the Pike's Peak Gold Rush and came to be known as the "Richest Square Mile on Earth".
What is the velocity of a wave with a frequency of 45 Hertz and a wavelength of 3 meters?
Answers
Explanation:
By using v=( f )x( lambda )
v= 45 s^-1 x 3 m
Therefore v = 135 ms^-1
A 221-gram ball is thrown at a speed of 36.7 m/s from the top of a 39.8-m high cliff. Determine the impact speed of the ball when it strikes the ground. Assume negligible air resistance.
Answers
Given:
The mass of the ball is
\(\begin{gathered} m=221\text{ g} \\ =0.221\text{ kg} \end{gathered}\)The initial height of the ball is
\(h=39.8\text{ m}\)The initial speed of the ball is
\(v_i=36.7\text{ m/s}\)To find:
the impact speed of the ball when it strikes the ground
Explanation:
The initial potential energy of the ball is
\(\begin{gathered} (PE)_i=mgh \\ =0.221\times9.8\times39.8 \\ =86.2\text{ J} \end{gathered}\)The initial kinetic energy is
\(\begin{gathered} (KE)_i=\frac{1}{2}mv_i^2 \\ =\frac{1}{2}\times0.221\times(36.7)^2 \\ =148.8\text{ J} \end{gathered}\)The final energy of the ball is fully kinetic energy. Let the final impact speed of the ball is
\(v_f\)We can write, using the energy conservation principle that
\(\begin{gathered} (PE)_i+(KE)_i=\frac{1}{2}mv_f^2 \\ 86.2+148.8=\frac{1}{2}\times0.221\times v_f^2 \\ v_f^2=2\times\frac{86.2+148.8}{0.221} \\ v_f=46.1\text{ m/s} \end{gathered}\)Hence, the final impact speed of the ball is 46.1 m/s.
When can acceleration be observed and what result will it have on an object?
Answers
Answer:
Work out the change in velocity for you given time.
Calculate the change in time for the period you are considering.
Divide the change in velocity by the change in time.
can increase the velocity of the object, decrease the velocity of the object, or change the direction of the velocity of the object.
Explanation:
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psychology is the study of which kind of human and animal behavior and mental processes?
A. subjective
B. observable
C. imagined