What is Earth's second atmosphere?

Why are denser materials found closer to earths center

AN Airplane flies at a constant speed of 430 km/hr how long will it take to travel 4563 km? long

If the decomposition of hydrogen peroxide is a first order reaction and it takes 20.0 minutes for the initial concentration to fall from 1.6M to 0.80M, how much time has passed when only 0.050M remain a) 80 min b) 120 min c) 100 min d) 40 min

A pitched ball is hit by a batter at a 45degrees angle and just clears the outfield fence, 98m away. Assume that the fence is at the same height as the pitch and find the velocity of the ball when it left the bat. Neglect air resistance.

A gas is confined in a cylinder with a piston. What happens when work is done on the gas?

A liquid filled sealed system has cylinders with movable pistons on each end. The face of one piston has an area of 5 cm². The other piston has an area of 500 cm² and is supporting a weight of 2 kN on it.

A turntable is spinning on a frictionless axle when a ball of putty is dropped onto it from above. The putty sticks to the turntable when it lands. Is angular momentum conserved for the turntable and putty (the system) during this process?

A cheetah can run from 0 to 70 mph in 2.2 seconds. what is the cheetah's top speed in m/s?

Which statement about how light travels is true? A Light waves need a medium to travel, and they travel at the same speed even if the light source is moving.

Explain why the car reaches a top speed even though the thrust Force remains constant at 3500N