An object's motion changes

A.

only when a nonzero net force is applied to the object.

B.

only if the object is at rest when a force acts upon it.

C.

when the forces acting on the object remain balanced.

D.

when there are no forces acting upon it.

Which scenario involves the most work? a. pulling a box with a force of 127 newtons across the floor for 8 meters b. holding a mass with a force of 509 newtons in your arms for 150 seconds c.

Suppose you lived in the crater Copernicus on the side of the Moon facing Earth. How often would the Sun rise? How often would Earth set? During what fraction of the time would you be able to see the stars?

Explain the concept of work

Friction a. is slow but steady movement along a fault. b. happens when rock is weak and can slip smoothly, without creating shock waves. c. is the process by which faults release energy. d. is the force that resists sliding along a surface

What is the kinetic energy of a baseball moving at a speed of 40 m/s if the baseball has mass of 0.15 kg?

The mass of a subway car and passengers is 45,500 kg. If it's acceleration as it leaves a station is 0.6 m/s2, what is the net force (in N) acting on it?

Which of the following determine an object's velocity? A. speed and direction B. direction and acceleration C. speed and mass D. speed, direction, and acceleration

The following statements regarding the exhaust gas recirculation (EGR) valve are all correct except: Low restriction exhaust systems will have no effect on EGR system operation. B.

A 10.0 V battery is connected to a 120-ohm resistor. Ignoring the internal resistance of the battery Calculate the power delivered to the resistor.

Hemoglobin (Hb) is the O2-carrying protein in our blood. Unlike myoglobin, it has four sites allowing it to bind up to four O2 molecules.