Answer:
Explanation:
From the question we are told that:
Mass 
Height 
Speed 
Angle 
Generally the equation for K.E is mathematically given by
Since
The potential energy and kinetic energy is equal to the kinetic energy as it hits the ground.
Therefore
The acceleration due to gravity g at height 7 times the radius of Earth above the surface of the Earth is 8.933 m/s².
<h3>What is acceleration due to gravity?</h3>
It is the acceleration caused by any object when placed on the surface on the Earth due to its weight.
The acceleration due to gravity is related to the distance as
g =GM/R²
where G is the gravitational constant = 6.67 x 10⁻¹¹ N.m²/kg²
Given is the height R = 7 x 6.4 x 10⁶ m and mass of Earth M = 6 x 10²⁴ kg
Substitute the values into the expression to find the acceleration due to gravity.
g = ( 6.67 x 10⁻¹¹ x 6 x 10²⁴)/ ( 7 x 6.4 x 10⁶)²
g = 8.933 m/s²
Thus, the acceleration due to gravity g at height 7 times the radius of Earth above the surface of the Earth is 8.933 m/s².
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They can continue moving without the need of an external force
Explanation:
Newton's first law of motion states that:
"An object in motion at constant velocity (or at rest) will continue moving at constant velocity (or will stay at rest) unless acted upon an external force"
In normal daily life, we normally experience something different: when we throw an object on a table, for instance, we notice that the object will eventually stop, instead of keep moving. This is because there is another force acting on the object, the force of friction, opposite to the motion, that "resists" the motion of the object eventually bringing it to a stop.
In space, however, there is no force of friction or air resistance. Therefore, Newton's first law can be applied: and so, if space travellers are in a ship, and this ship is moving at a certain constant velocity, it will keep moving at this velocity without slowing down, and no external force would be needed in order to keep the ship in motion.
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You can find velocity when acceleration is constant.
file example see below.
Answer:
The amplitude of vibration of string will increase due to which loudness of sound will increase
Explanation:
As we know that the guitar is based on the principle of Resonance. When string of the guitar vibrates at a given frequency then the sound produced in the hollow part of the guitar will also be at same frequency.
This is known as resonance condition, so guitar will produce same frequency sound as that of frequency of string.
Now if the string is plucked with increasing level of force then it will increase the amplitude of vibrations of the string due to which the sound produced in the guitar will also be of same level.
So here we can say that amplitude and intensity of sound related as
so on increasing amplitude the intensity will increase and hence it will produce loud sound
