A 40.0 kg ballet dancer stands on her toes during a performance with 25.0 cm2 in contact with the floor. What is the pressure exerted by the floor over the area of contact if the dancer is stationary

A ball is held 1.4 meters above the floor When the ball is held motionless above the floor, the ball possesses only what energy

What was the average speed in km/h of a car that travels 400.0 km in 4.5 h?

Which scientist developed a model that can be used to predict the structure of a molecule?

What structural adaptations do you think humans will develop

How does mass affect gravity?

calculate the force exerted on a rocket given that the propelling gases are expelled at a rate of 1500 kg/s with a speed of 4.0x10^4 (at the moment of take off)

Which of the following statements about electrons is not true? A) Electrons orbit the nucleus rather like planets orbiting the Sun. B) Within an atom, an electron can have only particular energies.

In longitude waves, the medium moves parallel to the direction of energy transport

Thomsonâs experiment is credited with the discovery of which particle?

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?