A 4,000-kg car traveling at 20m/s hits a wall with a force of 80,000 N and comes to a stop. What was the impact time?

In hydrogen, the transition from level 2 to level 1 has a rest wavelength of 121.6 nm. (A) Find the speed and direction for a star in which this line appears at wavelength 120.6 nm.

Explain why the gravitational attraction between the Sun and Earth increases as Earth moves from position C to position D

What is the frequency corresponding to a period of 4.31 s? answer in units of hz?

How is plasma different from other phases of matter?

A small metal sphere has a mass of 0.19 g and a charge of - 24.0 nC. It is 10.0 cm directly above an identical sphere that has the same charge. This lower sphere is fixed and cannot move. If the upper sphere is released, it will begin to fall.

8. A gas is contained in a horizontal piston-cylinder apparatus at a pressure of 350 kPa and a volume of 0.02 m3. Determine the work done by the piston on the gas if the cylinder volume is increased to 0.15 m3 through heating.

A 75.0 kg person stands on a scale in an elevator. (a) What does the scale read (in N and in kg) when the elevator is at rest?

The hinge at A and cable BDC support beam ABC. Cable BDC passes over the pulley D that is pinned to the ceiling. (Assume that the + x-axis is to the right and the + y-axis is up along the page.

The "zone of avoidance" a) Accounts for the absence of any planet between the orbits of Mars and Jupiter Prevents collisions between planets in the Solar System.

Electric current is ...