Questions from College Physics

Q: A block of mass 3.00 kg is placed against a

A block of mass 3.00 kg is placed against a horizontal spring of constant k = 875 N/m and pushed so the spring compresses by 0.070 0 m. (a) What is the elastic potential energy of the block–spring sys...

Q: A 60.0 - kg athlete leaps straight up into the

A 60.0 - kg athlete leaps straight up into the air from a trampoline with an initial speed of 9.0 m/s. The goal of this problem is to find the maximum height she attains and her speed at half maximum...

Q: A skater is using very low-friction rollerblades. A friend

A skater is using very low-friction rollerblades. A friend throws a Frisbee to her, on the straight line along which she is coasting. Describe each of the following events as an elastic, an inelastic,...

Q: A 2.10 x 103 - kg pile driver is used

A 2.10 x 103 - kg pile driver is used to drive a steel I - beam into the ground. The pile driver falls 5.00 m before coming into contact with the top of the beam, and it drives the beam 12.0 cm farthe...

Q: Two blocks are connected by a light string that passes over two

Two blocks are connected by a light string that passes over two frictionless pulleys as in Figure P5.24. The block of mass m2 is attached to a spring of force constant k and m1 > m2. If the system...

Q: A daredevil on a motorcycle leaves the end of a ramp with

A daredevil on a motorcycle leaves the end of a ramp with a speed of 35.0 m/s as in Figure P5.25. If his speed is 33.0 m/s when he reaches the peak of the path, what is the maximum height that he reac...

Q: Truck suspensions often have “helper springs” that engage at high

Truck suspensions often have “helper springs” that engage at high loads. One such arrangement is a leaf spring with a helper coil spring mounted on the axle, as sho...

Q: The chin - up is one exercise that can be used to

The chin - up is one exercise that can be used to strengthen the biceps muscle. This muscle can exert a force of approximately 8.00 x 102 N as it contracts a distance of 7.5 cm in a 75 - kg male.3 (a)...

Q: A flea is able to jump about 0.5 m.

A flea is able to jump about 0.5 m. It has been said that if a flea were as big as a human, it would be able to jump over a 100 - story building! When an animal jumps, it converts work done in contrac...

Q: A 50.0 - kg projectile is fired at an angle

A 50.0 - kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.20 x 102 m/s from the top of a cliff 142 m above level ground, where the ground is taken to be y =...