How can the first law of thermodynamics be used to explain how to reduce the temperature of an object?

The massless spring of a spring gun has a force constant k=12~/text{N/cm}k=12 N/cm. When the gun is aimed vertically, a 15-g projectile is shot to a height of 5.0 m above the end of the expanded spring. (See below.

How does energy from the Sun travel to Earth? A. through radiation B. through convection C. through conduction D. through the movement of particles

A 1.25 in. by 3 in. rectangular steel bar is used as a diagonal tension member in a bridge truss. the diagonal member is 20 ft long, and its modulus of elasticity is 30,000,000 psi. if the strain in the diagonal member is measured as 0.001200 in./in.

A brick sits on the top of a hill with a gravitational potential energy of 245 J. To determine the gravitational potential of the brick, we would also need to know which one of the following

Alcohol affects each of the following attributes of the eyes, except: A. The ability of the eyes to move in their sockets B. The ability of the pupils to expand and contract C. The ability of the tear ducts to lubricate the eyes

Ethylene (C2H4) reacts with oxygen gas to produce carbon dioxide and water. 45.0 grams of ethylene reacts, how many grams of carbon dioxide gas will be produced?

What causes ice to melt and water to boil

A block of mass 3.5 kg slides down a frictionless inclined plane of length 6.4 m that makes an angle of 30 degrees with the horizontal. if the block is released from rest at the top of the incline, what is its speed at the bottom

What is the wavelength of an earthquake wave if it has a speed of 5 km/s and a frequency of 10 Hz?

The gamma ray released by each decay carries 140kev of energy. find the total energy e released by decays in the 2 hours.