The change in velocity of the baseball is 39.72 m/s
<h3>What is change in velocity?</h3>
This is the difference between the final and the initial velocity of a body.
To calculate the change in velocity of the ball, we use the formula below.
<h3>Formula:</h3>
- Ft = mΔv.............. Equation 1
Where:
- F = Force exerted by the person
- t = time
- m = mass of the baseball
- Δv = Change in velocity.
Make Δv the subject of the equation
- Δv = Ft/m........... Equation 2
From the question,
Given:
- F = 12 N
- t = 0.480 s
- m = 0.145 kg
Substitute these values into equation 2
- Δv = (12×0.48)/0.145
- Δv = 39.72 m/s.
Hence, The change in velocity of the baseball is 39.72 m/s
Learn more about change in velocity here: brainly.com/question/112886
As the surface given is a smooth surface, we can use specular reflection. According to the law of specular reflection, the angle of incidence equals the angle of reflection, so it will also be 40°. Answer is A.
Answer:
Explanation:
Work done on the lever ( input energy ) = force applied x input distance
= 24 N x 2m = 48 J
Work done by the lever ( output energy ) = load x output distance
= 72 N x 0.5m = 36 J
efficiency = output energy / input energy
= 36 J / 48 J
= 3 / 4 = .75
In percentage terms efficiency = 75 % .
Answer:
.D.It will decrease because the charge will move in the direction of the electric field
Explanation:
<em>which there is a uniform electric field. (A uniform field is one whose strength and direction are the same at all points within the region.) What happens to the electric potential energy of the positive charge, after the charge is released from rest in the uniform electric field?A. It will remain constant because the electric field is uniform.B.It will decrease because the charge will move in the opposite direction of the electric field.C.It will remain constant because the charge remains at rest.D.It will decrease because the charge will move in the direction of the electric field.E.It will increase because the charge will move in the direction of the electric field.</em>
solution
The potential energy decreases, converted to kinetic energy
The charge will feel a force in the direction of the electric field (F=Eq) and thus it will accelerate with
a constant acceleration. (Just like releasing an object above the earth's surface - constant acceleration,
at least until it hits something.)
tus te answer will be
.D.It will decrease because the charge will move in the direction of the electric field
