True or false? a physical change is a change of matter from one form to another without a change in chemical properties

Two brothers, Frank and Dion, are on roller skates and standing still when they push off from one another. Frank's mass is 103.4 kg. Dion's mass is 51.6 kg. After they push off, Frank has a velocity of - 7 m/s. What will Dion's velocity be?

A crime suspect fled the scene when police officers entered the building. How far could he run in 10 minutes if he can run 5 miles per hour?

What is product of Cerium-141 undergoing beta decay?

Science requires theories that can be tested by research. true false

An aerobatic airplane pilot experiences weightlessness as she passes over the top of a loop-the-loop maneuver. The acceleration of gravity is 9.8 m/s^2 If her speed is 440 m/s at this time, find the radius of the loop. Answer in units of km.

An object has a mass of 8.00 kg. What is the gravitational force on the object by the earth?

Which of the following best characterizes the free energy change ΔG for an endothermic reaction under physiological conditions? A. The sign of ΔG is positive B. The sign of ΔG is zero C. The sign of ΔG is negative D.

In a recent hockey game, one player (m=100kg) was moving at a velocity of 8 m/s when he ran into another player (m=300kg) who was at rest (v=0m/s). After the collision, the two players were stuck together (moving with the same velocity).

In a laser, electrical energy is changed to light energy, and a small amount of the energy is wasted as heat. Describe the total amount of the heat in the system (using the conservation of energy).

What is the name for a star and planets held together by gravity? A. solar system B. galaxy C. black hole D. supernova