Two blocks A and B each of mass m are placed on a smooth horizontal surface. Two horizon forces F and 2F are applied on the two blocks A and B. The block A does not slide on block B. Then the normal reaction between the blocks is

A tuning fork produces a sound wave on air with a frequency of 261.6 hz. at room temperature the speed of sound is 343m/s. what is the wave length

A basket of negligible weight hangs from a vertical spring with force constant k. (a) A mass m is gently lowered into the basket and the spring is allowed to reach equilibrium. I. e. the mass is not released until the spring is in equilibrium.

A cylinder with a piston contains 0.8 kg of water at 100 degrees C. What is the change in internal energy of the water when it is converted to steam at 100 degrees C at a constant pressure of 1 atm?

A car accelerated at a rate of 3ft/s^2 for 2 seconds. at the end of this time period the velocity of the car was 55ft/s what was the car's velocity before it started to accelerate?

When you drop a pebble from height h, it reaches the ground with kinetic energy k if there is no air resistance. from what height should you drop it so it will reach the ground with twice as much kinetic energy?

Which, if any, of the heat engines violate (s) the second law of thermodynamics?

The ball is moving at a constant speed of 0.5 m/s for 2.3 seconds how far does it go?

Which of these is a mixture? calcium carbon dioxide salt water potassium

A train travels 80 kilometers in 2 hours, and then 79 kilometers in 4 hours. What is its average speed?

What does it mean when we say science is a cycle?