A block sits at rest on a table, 0.9 m above the ground. If the black has a six J of energy (with the ground set as zero height level), what is the mass of the block?

How many minutes does it take a train starting at rest to reach a velocity of 22.0 kmh-1 at an acceleration of 0.2ms-2?

Refrigerant 134a enters an air conditioner compressor at 4 bar, 20°C, and is compressed at steady state to 12 bar, 80°C. The volumetric flow rate of the refrigerant entering is 8 m3/min.

What is the mass if an object moving with a speed of 9m/s and a kinetic energy if 2000 J

Why do we balance chemical equations

A student is pushing a 50 kg cart, with a force of 600 N. Another student measures the speed of the cart, and finds that the cart is only accelerating at 3 m/s^2. How much friction must be acting on the cart?

The sources of the heat inside Earth

A microwave is rated at 750 watts. How long will it take the microwave to do 5700 J of work on a cup of water? Assume 100% efficiency. A) 0.13s B) 2s C) 7.6s D) 4,275,000 s

A block hangs at rest from the ceiling by a piece of rope. Consider the forces acting on the block. Is gravity present or absent?

A nurse counts 66 heartbeats in one minute. What is the period of the hearts oscillation? In minutes

A room is 16 ft x 12 ft x 12 ft. would air enter or leave the room if the temperature changed from 27°c to - 3°c while the pressure remained constant? Determine the volume of the air which moved in or out of the room.