At 2.5 seconds, the helicopter has a kinetic energy of 20 J. What is its mechanical energy at that time?

Which statements about tsunamis are true? They can occur only in water. They can occur in water and on land. We can predict them. Underwater landslides can cause them. Dam failures can cause them.

An archery bow is drawn a distance d = 0.29 m and loaded with an arrow of mass m = 0.094 kg. The bow acts as a spring with a spring constant of k = 112 N/m, and the arrow flies with negligible air resistance.

A migrating robin flies due north with a speed of 12 m/s relative to the air. The air moves due east with a speed of 6.8 m/s relative to the ground.

What is the volume of an aluminum cube with edges that are 10 centimeter cubes

The star Vega has an apparent visual magnitude of 0.03, and the star HR 4374 has an apparent visual magnitude of 4.87. It has been determined that both stars are at the same distance from Earth.

What is the speed of a car going v=1.000mphv=1.000mph in SI units? Notice that you will need to change from miles to meters and from hours to seconds. You can do each conversion separately.

What made it possible to construct skyscrapers in the 1800s

A 4.0-kilogram object is accelerated at 3.0 meters per second2 north by an unbalanced force. The same unbalanced force acting on a 2.0-kilogram object will accelerate this object toward the north at (1) 12 m/s2 (3) 3.0 m/s2 (2) 6.0 m/s2 (4) 1.5 m/s2

Religion, astrology, and handwriting analysis are all believed in and used by many people. How are they different from psychology?

A ball is thrown straight down a at 10.0 m/s from a 32.4 m-high building. How long does it take to reach the ground? What is the speed the moment before it hits the ground?