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Q. A vertical spring with a spring steady of 420-N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.30 kg block is dropped from rest. It collides with and sticks to the spring that is compressed by 2.5-cm in bringing the block to a momentary halt. Assuming air resistance is negligible; from what height (in cm) above compressed spring was the block dropped?
A 32.8 g piece of aluminium at 72 is dropped into a cavity in an extremely large block of ice at 0. How much ice mice does aluminium piece melt.
Find the energy of the capacitor at the moment.
The range of human hearing extends from approximately 20 Hz to 20000 Hz. Find out the wavelengths of these extremes while speed of sound in air is equal to 348 m/s.
Bacteria vary somewhat in size, but a diameter of 2.0 nanometers is not unusual. What would be (a) volume (in cubic centimeters) and (b) surface area (in square millimeters) of such a bacterium, assuming that it is spherical.
A ball has fallen to the street below, and a passerby returns it by launching it at an angle of 53.0° above the horizontal at a point 26.0 m from the base of the building wall. The ball takes 2.20 s to reach a point vertically above the wall.
The difference in potential between the accelerating plates of a TV set is about 26000 V. If the distance between these plates is 1.5 cm, find out the magnitude of the uniform electric field in this region.
A photon with a wavelength 4.40 scatters from an electron initially at rest. Find out the wavelength of the scattered photon when the scattered electron has its utmost kinetic energy. Kmax = 2.37*20^-14.
A 15kg crate is moved along a horizontal floor by pulling on it with a rope that makes a 30 degree angle with the horizontal. The tension in the rope is 200N and the crate slides a distance of 10m.
Calculate the magnitude and direction of net electric field. what is the efficiency of the engine under those conditions.
The Hall voltage across a conductor in a 55 magnetic field is 1.9 . When used with the same current in a different magnetic field, the voltage across the conductor is 3.
A 110 g cube of ice at 0°C is dropped into 1 kg of water that was originally at 90°C. What is an final temperature of the water after the ice has melted.
What is the speed of projectile immediately before it hits the ground if air friction does one and a half times as much work on projectile when it is going down as it did when it was going up.
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