Determine the stiffness of the spring to hold the 85-kg crate in the position shown.

Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 5.8 m/s2 for 3.3 seconds. It then continues at a constant speed for 9.

Using the formula for kinetic energy (K=1/2mv2), calculate the kinetic energy when m = 423 and v = 4.71.

How does air blowing from a fan make you feel cooler if the air is the same temperature?

When the temperature in the air is 50°C, the velocity of a sound wave traveling through the air is approximately A. 381 m/s B. 30 m/s C. 50 m/s D. 361 m/s

Which of the following stars has the highest surface temperature? A. red star B. blue star c. yellow star D. orange star

Ganymede is one of the many moons of jupiter. it is nearly a sperical in shape. it is larger than the planet mercury and slightly smaller than the planet mars.

Which of the following statements about two carts rolling on a track and experiencing a completely inelastic collision is TRUE? a. The kinetic energy of the system is conserved to good approximation. b.

If element X has 17 protons, how many electrons does it have?

A 2.0-kilogram laboratory cart is sliding across a horizontal frictionless surface at a constant velocity of 4.0 meters per second east. What will be the cart's velocity after a 6.0-newton westward force acts on it for 2.

A boat floats with 25% of its volume under water. a. What is the boatâs density? b. If the boat was made from 500 kg of metal, what is the volume of the boat? (Assume the air in the boat has negligible mass and density) c.