Which is NOT a symptom of hemophilia:
А.Excessive bleeding

B.Easy bruising

C.Heart attack

D. Joint pain

Answer:

20 cm

Explanation:

Given that a ball is released from a vertical height of 20 cm. It rolls down a "perfectly frictionless" ramp and up a similar ramp. What vertical height on the second ramp will the ball reach before it starts to roll back down?

Since it is perfectly frictionless, the Kinetic energy in which the ball is rolling will be equal to the potential energy at the edge of the ramp.

Therefore, the ball will reach 20 cm before it starts to roll back down.

Answer:

The answer is the third one.

C.

Hope this helps!

A driver travels 135 km east in 1.5 h stops for 45mins for lunch and then resumes driving fir the next 2.0h through a displacement of 215 kn east.  the drivers average velocity is 82.3 km / hr.

given that :

distance travel d1 = 135 km

time taken t1 = 1.5 h

hault time t = 45 mins = 0.75 h

distance travelled d2 = 215 km

time t2 = 2.0 h

Average velocity  =  Total time taken / time

Average velocity = ( 135 km + 215 km ) / ( 1.5 h + 0.75 h + 2.0 h)

                            = 350 km / 4.25

                            = 82.3 km / hr

Thus, A driver travels 135 km east in 1.5 h stops for 45mins for lunch and then resumes driving fir the next 2.0h through a displacement of 215 kn east.  the drivers average velocity is 82.3 km / hr.

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Answer:

kE=1/2mv^2

Explanation:

here

KE= 15000j

velocity =20m/s

mass=?

now

mass=

15000×2= (m)20^2

30000=m ×400

30000÷400=m

Mass (m)= 75

therefore mass is 75kilogram

Answer:

The work done by the 20 N force is 61.3 J

Explanation:

20 N Force at horizon is: F=20 N*cos 40=15.32 N

The work done by 20 N at horizon is: W=F*S=15.32 N* 4 m=61.3 J

Answer:

The work done by the 20 N force is 61.3 J

Explanation:

Answer:

B. Negative acceleration means this car is slowing down.

Explanation:

for the other screenshot

Average acceleration = change in velocity /change in time.

[a = ∆V/∆t] —this the formula.

NOTE:

u = initial velocity (velocity it started with)

v = final velocity (velocity it ended with)

t = time {the time you were given)

a = acceleration.

listing out our givens:

u =o —(the unit is m/s)

v = 40 —(the unit is also m/s)

t = 0.08 —(the unit is s) "s" means second(s).

Soo

a = 40-0 / 0.08 = 500 m/s² ( unit for velocity is m/s²)

( Remember when using the formula we subtract the initial from the final velocity.........I mean we remove the initial from final) if not you will get a negative answer or wrong answer).

also note: final velocity is always bigger in value than initial velocity EXCEPT it is in deceleration meaning for example a car that was speeding is gradually stopping then initial (the one it started with) will be bigger than the one it ended with (because as it gradually stops the speed reduces).

VELOCITY is speed in a specified direction.

you're super free to ask any questions

Good luck ✅.

The correct answer is frame of reference

Motion is a simple idea to grasp, but depending on the degree of detail required, it might turn out to be a fairly difficult item to calculate. Motion may be defined simply as the measurement of movement in a certain direction. Several forces, including mass, friction, velocity, and distance, must be understood in order to determine movement and direction.

An item must move in order to measure motion. Starting from one position in space and terminating at another is what is meant by this definition. Though time is not required to show motion, it is sometimes added to the calculation of speed to account for the time needed to go from one location to another. In theoretical mathematics, movement is typically represented as an x-y cartesian graph.

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Answer:

Acceleration=5.6 m/s

Explanation:

Dunno the rest

A train is loaded with passengers so that it has a total mass of 2500 kg., the Acceleration=5.6 m/s

Acceleration can be defined as the rate of change of velocity with respect to time, is a vector quantity associated with both magnitude and direction.

Acceleration is the second derivative of position with respect to time or it is the first derivative with respect to time; The SI unit of acceleration is given as, m/s2.

Acceleration can be up two types such as Uniform and Non-uniform acceleration,  in a circle where speed remains constant but  the direction is changing followed by velocity changes, and the body is said to be accelerated.

The average acceleration can be defined as the total change in velocity in the given interval period of time means the total time taken for the change. For a given interval of time, it is represented as ā.

Instantaneous acceleration can be defined as the ratio of change in velocity in a given time interval such that the time interval goes to zero.

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Answer:

A

Explanation:

because it is accelerating and as the vehicle accelerates the speed increas

The classical model ignores cyclical unemployment, which is a type of unemployment that occurs when there is a downturn in the business cycle and overall economic activity decreases.

The classical model assumes that markets will always clear and that any unemployment is due to individuals voluntarily choosing not to work or being unable to find work due to personal factors such as lack of skills or mobility. Therefore, the classical model does not account for the possibility of systemic unemployment caused by macroeconomic factors such as recessions or depressions.
                                              The classical model ignores cyclical unemployment. A critical assumption in the classical model is that the labor market is always in equilibrium, meaning that the quantity of labor demanded equals the quantity of labor supplied.

                                                    This assumption implies that there is no involuntary unemployment, and any unemployment that occurs is considered frictional or structural. However, this assumption does not account for cyclical unemployment, which occurs due to fluctuations in the business cycle and overall economic activity.

Therefore, the classical model does not account for the possibility of systemic unemployment caused by macroeconomic factors such as recessions or depressions.

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Answer:

75%(TT,Tt,tt) Hope that helps

Answer:

The correct option is A

Explanation:

Buoyancy can be described as the upward force that causes an object to float on water. When the buoyant force of a liquid is greater than the weight of an object, the object will move to the surface of the liquid and float (because the buoyant force would be able to push it upwards). If the buoyant force is lesser than the weight of the object, the object will sink (because the buoyant force would not be able to push the object upwards). And when the buoyant force and weight of an object cancel out, the object would be suspended at the depth that this occurs.

Thus, from the explanation above, it can be deduced that for an object to float, buoyant force must be greater than weight of the object. Thus, the correct option is A.

An object will float on a fluid when the buoyant force acting on the object is equal to the weight of the object. This condition is described by option C: Buoyant force equals weight.

When an object is placed in a fluid, it experiences an upward force called the buoyant force. The buoyant force is a result of the pressure difference between the top and bottom surfaces of the object. It depends on the density of the fluid and the volume of the object submerged in the fluid.

For an object to float, the buoyant force must be equal to the weight of the object. If the buoyant force is greater than the weight, the object will experience a net upward force and will rise to the surface. In this case, the object will not remain floating, but rather float upwards.

If the buoyant force is less than the weight, the object will experience a net downward force and will sink in the fluid. The object will not float but instead submerge into the fluid.

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Answer:

Approximately \(69\; {\rm N}\) at approximately \(126^{\circ}\).

Explanation:

Assume that both angles in the question are relative to the positive \(x\)-axis (towards the positive horizontal direction.)

Horizontal component (\(x\)-component) of the two forces would be:

Note that the \(x\)-component of the \(90\; {\rm N}\) force is negative since this components points away from the positive \(x\!\)-direction.

Hence, the net force in the \(x\)-component would be:

\((50\; {\rm N}) \, \cos(30^{\circ}) + (90\; {\rm N}) \, \cos(160^{\circ}) \approx (-41.3) \; {\rm N}\).

(Again, this component is negative since it points away from the positive \(x\)-axis.)

Similarly, the vertical component (\(y\)-component) of the two forces would be:

Hence, the net force in the \(y\)-component would be:

\((50\; {\rm N}) \, \sin(30^{\circ}) + (90\; {\rm N}) \, \sin(160^{\circ}) \approx 55.8\; {\rm N}\).

Refer to the diagram attached. The resultant net force is the vector sum of the components. Apply the Pythagorean Theorem to find this net force:

\(\begin{aligned}(\text{net force}) &= \sqrt{(\text{$x$-component})^{2} + (\text{$y$-component})^{2}} \\ &\approx \sqrt{(-41.3)^{2} + (55.8)^{2})}\; {\rm N} \\ &\approx 69\; {\rm N}\end{aligned}\).

Find the angle of this net force relative to the positive \(x\)-axis using the inverse cosine function \(\arccos\):

\(\begin{aligned}\arccos\left(\frac{(\text{$y$-component})}{(\text{net force})}\right) &\approx \arccos\left(\frac{55.8\; {\rm N}}{69\; {\rm N}}\right) \\ &\approx 126^{\circ}\end{aligned}\).

(The units might need to be converted into degrees.)

The best evidence that Earth revolves around the Sun is the apparent daily path of the Sun, rising in the east and setting in the west.

Option B, the Sun following an apparent daily path, provides the strongest evidence that Earth revolves around the Sun. This phenomenon is caused by the rotation of the Earth on its axis.

As the Earth spins from west to east, it gives the illusion that the Sun is moving across the sky from east to west. The Sun rises in the east, reaches its highest point in the sky at noon, and then sets in the west.

This daily motion of the Sun is consistent and predictable, providing strong evidence that the Earth is in motion. While the other options mentioned in the question provide interesting celestial phenomena, they do not directly prove the Earth's revolution around the Sun.

Option A describes the apparent circular paths of stars around the North Star, Polaris. This is a result of the Earth's rotation but does not provide evidence of its revolution around the Sun.

Option C mentions the repeating seasons, which are caused by the tilt of the Earth's axis as it orbits the Sun, but do not directly demonstrate the Earth's revolution.

Option D refers to the Foucault pendulum, which demonstrates the rotation of the Earth but does not provide evidence of its revolution around the Sun.

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Answer:

The final velocities of the blocks are 3.00 m/s and 8.50 m/s, respectively.

A diverging lens has a focal length that has a magnitude of 33.0 cm. an object is placed 21.0 cm in front of this lens. The magnification will be  -12.833 cm

diverging lens = concave lens

focal length = - 33 cm

u = - 21 cm

magnification = image distance / object distance

using lens formula

1/v - 1/u = 1/f

1/v = 1/f + 1/u

    = 1/-33 -1/21

v   = -12.833 cm

A diverging lens has a focal length that has a magnitude of 33.0 cm. an object is placed 21.0 cm in front of this lens. The magnification will be  -12.833 cm

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The most scientific guess (hypothesis) based on what is known about the behavior of galaxies is that Galaxies are continuously moving away from each other. This hypothesis can be tested using Hubble's Law.

Hubble's law indicates that almost all galaxies are moving apart from one another because the universe as a whole is expanding. Choose any two galaxies at arbitrarily, and they're most likely traveling apart from each other.

Hubble discovered that galaxies move away from us at a rate proportionate to their distance: more distant galaxies move away faster than closer ones. The accompanying graphic shows Hubble's classic graph of measured velocity vs. distance for neighboring galaxies.

The graph shows a linear relationship between galaxy velocity (v) and distance (d).

The equation for the above linear relationship is:

                                          v = H₀ x d

Where:

H₀ is the expansion rate

v = velocity of the galaxy; and

d = distance.

Using the above formula, the astronomer can measure or test to know whether indeed the new galaxy is moving relative to the Milky Way galaxy and at what rate.

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The equivalent resistance between points A and B in the diagram is 22 Ω

We shall begin by obtaining the equivalent resistance in parallel (i,e the three 6 Ω resistor). Details below:

1/Rₜ = 1/R₁ + 1/R₂ + 1/R₃

1/Rₜ = 1/6 + 1/6 + 1/6

1/Rₜ = 3/6

1/Rₜ = 1/2

Rₜ = 2 Ω

Finally, we shall determine the equivalent resistance between A and B (i.e series arrangement). Details below:

R = R₁ + R₂ + R₃ + R₄ + R₅ + R₆ + R₇ + R₈ + R₉ + R₁₀ + R₁₁

R = 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2

R = 22Ω

Thus, we can conclude that the equivalent resistance is 22 Ω

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Answer:D

Explanation:

i’m not sure if that’s right but that’s what i think

Answer:

speed and velocity are different because speed is the distance traveled per unit time but the velocity is displayed displacement per unit time is tourism scalar quantity and velocity is a vector quantity speed is always positive but velocity can be positive

With 4.3 m/s velocity, is the cheetah running.

velocity= distance/time

distance=27.6 m

time=6.3 s

velocity=27.6 m/6.3 s

velocity=4.3 m/s

A vector number known as velocity describes "the pace at which an item changes its location." Imagine a person moving quickly, taking one stride ahead, one step back, and then beginning from the same place each time. A vector quantity is velocity. As a result, velocity is aware of direction. One must consider direction while calculating an object's velocity. Saying that an item has a velocity of 55 miles per hour is insufficient. The direction must be included in order to adequately characterize the object's velocity. Simply said, the velocity vector's direction corresponds to the motion of an item.

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Answer:

Real Image

Explanation:

Images which are formed on the screen by the actual intersection of light rays are called real images.

Answer:

Explanation:

hope this helps you.

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Answer:

They get it from the air and soil. They also take energy from the sun.

Explanation:

During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil.

Answer:

5N westward, acting on the student

Explanation:

Answer: 5N westward, acting on the student

Explanation:

The resistance of a wire changes if we replace it with a longer wire, with a thicker wire, or with a wire of another material. The resistance of the wire increases when the length is increased, when the diameter is increased, and when the material is changed.

The resistance of a wire changes in the following ways when we replace the wire:

1. Longer wire: The resistance of a wire is directly proportional to its length. Therefore, if we replace the wire with a longer wire, the resistance will increase.

2. Thicker wire: The resistance of a wire is inversely proportional to its cross-sectional area. Therefore, if we replace the wire with a thicker wire, the resistance will decrease.

3. Wire of another material: The resistance of a wire is also dependent on the material it is made of. Different materials have different resistivities, which affect the resistance of the wire. Therefore, if we replace the wire with a wire of another material, the resistance will change depending on the resistivity of the new material.

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If the velocity-time equation for a golf cart is v = (1 m/s) + (-0.5 m/s)t , then the initial velocity of the cart would be 1 m / s and the acceleration of the cart would be - 0.5 m / s² .

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 problem the velocity-time equation for a golf cart is

v = (1 m/s) + (-0.5 m/s)t ,

The initial velocity of the cart at t = 0  would be 1 m / s.

By differentiating the given equation of the velocity,

The acceleration of the cart would be -0.5 m / s.

Thus, the initial velocity would be 1 m / s and the acceleration would be  -0.5 m / s.

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