A crane is holding up a concrete block with a steel cable. What is a contact force that is acting on the block?
A.
tension
B.
static electricity
C.
magnetism
D.
gravity

Ared apple is illuminated by a blue light the apple will appear

Acommercial passenger jet can travel up to 970 km/hr at an altitude of 30,000 feet. at this speed, how long will it take the jet to travel 1,865 kilometers? a. 2.3 hrs b. 1.9 hrs c. 1.7 hrs d. 1.5 hrs

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects