Why are satellites placed into orbit at least 150 km above Earth's surface?

to avoid air resistance

to match Earth's curvature

to create inertia

to increase friction

Your friend, who is age 15 and has a resting heart rate of 70, wishes to start a jogging program. What would you suggest as a proper starting target heart rate? 138 115 178 155

A 4,000-kilogram truck travels in a straight line at 10.0 m/sec. What is its momentum?

A tennis ball is served horizontally from 2.4m above the ground at 30 ms

Imagine an elevator crowded with too many passengers for such a small space. This situation would be a good analogy for a substance with what property

A constant current of I = 15 A exists in a solenoid whose inductance is L = 2.8 H. The current is then reduced to zero in a certain amount of time.

What is the critical angle θcrit for light propagating from a material with index of refraction of 1.50 to a material with index of refraction of 1.00? express your answer in radians?

Which of these could NOT be used to find the mechanical advantage of an inclined plane? A. input force B. output force C. percent efficiency D. length and height of inclined plane

What are the Rules of magnetism

Two spheres of the same radius, but of different masses, are both fully submerged in water. The lighter sphere is held below the water line by a rope anchored to the bottom of the container. The heavier sphere is suspended from a rope.

How does an increase in thermal energy affect molecules?