Answer:
<em>The product of the object's weight and the horizontal distance between the two positions.</em>
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Explanation:
Work is the product of force and the distance through which this force is moved. The distance moved can be vertical, or horizontal. For two bodies located the same distance from the center of the earth, the work done will be the product of the weight of the product and the horizontal distance between the two positions. <em>If the vertical work is needed, then the work is zero, since there is no height gradient between them</em>.
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Answer:
13.5 ms
Explanation:
The sound wave travels with uniform motion in both cases, so the time taken to cover a distance d is given by:
where
d is the distance to cover
v = 340 m/s is the speed of sound in air
So for the people across the newsroom,
d = 4.7 m
So the time taken is
The radio waves instead travels with uniform motion at the speed of light:
So the time taken for them is
where
d = 82 km = 82,000 m
is the distance of the people who are 82 km away. Substituting,
Therefore, the difference in time is
Yes. It's approximately the same, but not exactly.
The weight of an object 7 miles above the Earth's surface (the gravitational force on it) is about 0.35% less than it is down on the surface.
Answer:
The vertical component of the acceleration is equal to the acceleration due to gravity g.
Explanation:
Given data,
The initial velocity of the football, u = 31 m/s
The angle of direction of the football with the horizontal, Ф = 41°
In free fall, the vertical component of acceleration always remains the same.
Since the ball is clicked in a particular direction that has a vertical component, then the vertical component of the velocity of the ball is always acted upon by the gravitational force of the earth.
The horizontal component of the velocity of the projectile remains the same because the gravitational force doesn't act in the horizontal direction.
Since the only force is the gravitational force acts on the projectile, the vertical component of the acceleration is equal to the acceleration due to gravity g.
