A stream of water flowing horizontally with a speed of `15m s^-1` gushes out of a tube of cross-sectional area `10^-2 m^2`, and hits a vertical wall nearby. What is the force exerted on the wall by the impact of water, assuming it does not rebound ?

A bullet of mass 40 g hits a mud wall with speed 400 m s^-1 . The bullet stops after penetrating 50 cm inside the wall. Find the average resistive force exerted by the wall on the bullets.

A wire of length15m (meter) and uniform area of cross section 6.0 xx 10^-7 m^2 has resistance of 5.0 Omega (ohm). What is the resistivity of the material of the wire ?

A ball is projected horizontally with a velocity of 4 ms^-1 .What will be its velocity after 0.7 sec (g=10 m s^-2) ?

A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 xx 10^-7 m^2 , and its resistance is measured to be 5.0 Omega . What is the resistivity of the material at the temperature of the experiment?

A bolt of mass 0.3 kg falls from the ceiling of an elevator moving down with an uniform speed of 7 m s^-1 . It hits the floor of the elevator (length of the elevator = 3 m) and does not rebound. What is the heat produced by the impact ? Would your answer be different if the elevator were stationary ?

A negligible small current is passed through a wire of length 15 m and uniform cross section 6.0 xx 10^-7 m^2 and its resistance is measured to be 5.0 Omega . What is the resistivity of the material?