A 20 kg crate of books is at rest on a table. what is the normal force on the books?

Describe the energy change in the particles of a substance during melting. A) The kinetic energy of the particles remains unchanged. B) Absorbed energy results in the change in potential energy.

In which item is energy stored in the form of gravitational potential energy? a slice of bread a compressed spring an apple on a tree a stretched bow string

Sheila weighs 60 kg and is riding a bike. Her momentum on the bike is 340 kg•m/s. The bike hits a rock, which stops it completely and throws Shelia forward onto the pavement If there is no net force on the system, what is Sheila's velocity

Based on observations, the speed of a jogger can be approximated by the relation v 5 7.5 (1 2 0.04x) 0.3, where v and x are expressed in mi/h and miles, respectively.

In a ballistics test, a 24 g bullet traveling horizontally at 1300 m/s goes through a 25-cm-thick 360 kg stationary target and emerges with a speed of 930 m/s. The target is free to slide on a smooth horizontal surface.

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 ...

What type of ethic is life-centered and views humans as just one component life on Earth