During a phase change, the temperature of a substance

A. increases.

B. decreases.

C. does not change.

D. increases or decreases.

What is a force and what units are used to measure force?

What will net force of object be if balanced forces act on it

Electrons. All in the blanks. 1. The atomic number of potassium is 19 Therefore there are __protons in the of the potassium atom. The symbol of potassium is Potassium has a mass of It 2.

A 45.0 kg ice skater stands at rest on the ice. A friend tosses the skater a 5.0 kg ball. The skater and the ball then move backwards across the ice with a speed of 0.5 m/s.

A 2.4 kg box has an initial velocity of 3.6 m/s upward along a plane inclined at 27◦ to the horizontal. The coefficient of kinetic friction between the box and the plane is 0.12. The acceleration of gravity is 9.81 m/s 2.

A planet is discovered orbiting around a star in the galaxy Andromeda at four times the distance from the star as Earth is from the Sun.

Measurements of how orbital speeds depend on distance from the center of our galaxy tell us that stars in the outskirts of the galaxy. True or False

Identify what is required to calculate the atomic number and atomic mass of an element

What device is used to measure the current in a circuit

A lever allows a 35 N load to be lifted with a force of 7 N. What is the mechanical advantage of the lever?