Answer: 299,427.84 J, 99,809.28 W
Explanation: we will assume the acceleration of the body to be constant, hence newton's laws of motion is applicable.
From the question
Force (f) = 75 N
Mass of object (m) = 6kg
Initial velocity (u) = 20 m/s
Final velocity (v) = 58 m/s
Time taken (t) = 3s
Recall that
F = ma
75 = 6a
a = 75/6 = 12. 5 m/s²
We need to get the distance before we can get the work done.
Recall that v² = u² + 2as, where s = distance covered
56² = 20² + 2(12.5)s
56² - 20² = 25s
2736 = 25s
s = 2736/ 25 = 109.44m
Work done = force × distance
Work done = 75 × 109.44 = 299,427.84 j
Power = work done / time
Power = 299,427.84 / 3
Power = 99,809.28 W
For a neutral atom number of electrons equals number of protons, in other for the net charge of the atom to be zero...
no. of electrons = 12
Answer: Weight only.
Explanation: Mass is a measure of the amount of matter in an object. Weight is a measure of the gravitational force exerted on the material in a gravitational field. Mass and weight are proportional to each other, with the acceleration due to gravity as the proportionality constant.
If a rock is transported from the moon to the earth, the mass is constant for the object but the weight will depends on the locations of the object. The gravitational acceleration would change because the radius and mass of the Moon is different from the Earth.
Thus, the object (rock) has <em>mass, m</em> both on the surface of the Earth and the surface of the Moon; but it will <em>weight</em> much less on the surface of the Moon as the Moon's surface gravity is 1/6 of the Earth.
The dog walked 5 meters backwards in the first 10 seconds, then 5 meters forward from 10-20 seconds. After 20 sec he was back where he started. Displacement (20sec) = zero.
Answer:
yeah I'm Pretty sure it's b
