body of mass 1 kg is thrown upwards with a velocity 20 m s−1. It momentarily comes to rest after attaining a height of 18 m. Calculate how much energy is lost due to air friction? (Take g= 10 ms-2)
Question 2:
2.(a) A body of mass 1 kg is thrown upwards with a velocity 20 m s−1. It momentarily comes to rest after attaining a height of 18 m. Calculate how much energy is lost due to air friction? (Take g= 10 ms-2)
3). If a motor is rated at 5.60 kW. How much work can it do in 20 minutes?
4).A tow-truck is pulling a trailer up a steep hill. If it has a 3730 W power, how much work does the truck do in a minute?
5). A bullet of mass 5 g is fired from a gun of mass 5 kg. What is the velocity of the muzzle of the gun if the velocity of the bullet is 500 m/s.
6). A wagon weighing 1000 kg moves 50 m/s on smooth rails. Later, a mass of 250 kg is placed in the wagon. What is the velocity with which it moves?
7). A specific
This electromagnetic wave is…
8).All electromagnetic waves travel through a vacuum at…..
9). The vibrations of a transverse wave move ……
10). When light crosses a boundary between air and water, the following quantity of light remains the same:
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