fourth grade science

01. A man of mass 60 kg runs up a flight of 60 steps in 40 seconds. If each step is 20 cm high, calculate his power. Solution : Since the man runs up a flight of steps, the work done will be equal to the potential energy. Height = height of one step x number of ste..

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Mass of the toy car (m) = 150 g Velocity (v) = 5 m/s Momentum (p) = mv Momentum = 0.75 kg ..

Question: 1 newton = ________ 1. 2. 3. 4. Answer: ..

Mass (m) = 10 kg Acceleration (a) = 7m/s 2 Force = 70 kgm/s 2 Force = 7..

Where M m and R m are the mass and radius of the moon respectively. Divide equation (1) by equation (2) We know that mass of the Earth is 100 times that of the moon and its radius is four times that of the moon. i.e., M e = 100 M m R e = 4 R..

Force of Attraction Between Two Bodies of Mass m Separated by a Distance 3d That is, when the distance is doubled, the force will be reduced to 1/4 t h of the original value of force and when the distance is increased three times, the force will be reduced to 1/9 t h of the or..

Let us now calculate the force of attraction between an object of mass 50 kg and Earth. The mass of the Earth is about 6 x 10 2 4 kg. The distance between the Earth and the object is approximately 64 x 10 5 m. The force of attraction between the object and the Ear..

Certain reactions take place with the help of an electric current.Example: Decomposition of acidulated water to give hydrogen and oxygen g..

Question: SI unit of acceleration is __________. 1. 2. 3. 4. Answer: ..