Answer:
A
Explanation
i think its a not 100% sure though.
Answer:
Change in Kinetic Energy is
Solution:
As per the question:
Mass of space craft,
Mass of the sun, M =
Radius of the orbit, R =
Radius of smaller orbit around the sun, r =
Now,
We know that the Gravitational Potential Energy is given by:
where
G = Gravitational constant
r = distance of the space craft from the center of the sun
Now,
Initial Gravitational Potential Energy is:
Now,
Final Gravitational Potential Energy is:
Change in the Gravitational Potential Energy equals the change in the kinetic energy of the space craft.
Thus
The minimum input force she'll need to lift the ball is 35 N.
Explanation:
Mechanical advantage of a single pulley is 1. As, she applies 70 N of force to lift the bowling ball, so the output force(weight of the ball) is also 70 N.
Now, adding another pulley gives a mechanical advantage of 2. We have,
M.A = (Output Force)/(Input Force)
Substituting the values we get,
= 35 N
Input force equals to 35 N needs to be applied.
Answer:
Neither.
Explanation:
After 10 seconds the object will have travelled 490.5m, not 98.1. The vertical distance covered in freefall by an object in time t is given by Distance= 1/2 x 9.81 x t^2. Simply multiplying 9.81 by the time will NOT give the distance covered.
The acceleration of the object will not change, it will always be 9.81 m/s^2. Its speed will keep increasing by 9.81 m/s every second, thats what the ‘per second squared*’ means. The speed after 10 seconds will be 98.1 m/s
To summarise, after 10 seconds, the object will have covered 490.5 metres, and it will have a final speed of 98.1 m/s. It’s acceleration will remain 9.81 m/s^2 at all times
Answer:
0.241
Explanation:
resolving weight into two components and calculating force of friction in terms of coefficient of friction and then applying Newton 's law we get the value .This all has been explained in attachment