A body of mass 5kg falls from a height of 10m above the g...
A body of mass 5kg falls from a height of 10m above the ground. What is the kinetic energy of the body just before it strikes the ground? (Neglect energy losses and take gravity as 10ms^2)
5J
25J
250J
500J
625J
Correct answer is D
v2 = u2 + 2gh = 0 + 2 x 10 x 10
v2 = 200; K.E = 1/2m
v2 = 1/2 x 5 x 200 = 500J
Which of the following devices is associated with alternating currents only? ...
The following are some units i. Ns ii. Mm iii. Nm-2 iv. JKg-1 What is the unit of latent he...
A radioactive source emits X–rays of very short wavelength (10 -13m ). what is the frequency&n...
I. Mass II. Density III. Temperature IV. Nature of substance which of the above affect diffusion...
The effect of closing the key K in the circuit shown in the figure above would be to? ...
A source of sound produces waves in air of wavelength 1.65m. If the speed of sound in air ...