True or False?

Atoms of the same element can have

different numbers of neutrons and

electrons.

What is an oscillation or disturbance that travels through space called?

Which is an example of projectile motion? a person throwing a rock a child swinging on a swing set an athlete running on a track a teacher picking up a pencil

A worker pushed a 27kg block 9.2 m along a level floor atconstant speed with a force directed 32o below thehorizontal. If the coefficient of kinetic friction betweenblock and floor was 0.

A car travels at an average speed of 65 mph for 10 hours how far did it travel A 65 miles. B 650 miles 10. Miles 6500 miles

What can convert electricity into mechanical energy? A. an electromagnets B. a compass C. a generator D. a motor

A car's position in relation to time is plotted on the graph. What is the car's average velocity for segment C? A) - 4 m/s B) - 0.25 m/s C) 0.25 m/s D) 4 m/s

What percent of my Iodine-131 sample will be left after 7 half-lives?

A 58.0 kg snow skier is on the top of 351 m high hill. After she has gone down a vertical distance of 142 m, what is her mechanical energy? Explain your answer (CER) !

A sphere has a mass of 2.10kg and travels along a horizontal plane at the velocity of 12.2m/s. Find the energy

What is the force required to accelerate a baseball with a mass of 0.145 kilograms and an acceleration of 35.00 meters/second squared?