Alisa, a skateboarder, is riding down a hill. If Alisa and the skateboard are considered a single object, what forces are acting on her? check all that apply

push

gravity

normal force

friction

tension

Julia throws a ball vertically upward from the ground with a speed of 5.89 m/s. Andrew catches it when it is on it's way down at a height of 1.27 m from the ground. After how much time does andrew catch the ball?

If the universe is expanding, what is outside it? If there is nothing outside it, how does it expand to create void?

Which of the following is a scalar quantity? A. 8 miles to the south B. 100 feet C. 95 mph west D. 14 m/s up

The mass of car 2 is Avice the mass of car 1. If both cars have the same velocit, how does the kinetic energy of car 2 compare to car 12 * Car 2 has four times the kinetic energy Car 2 has wice the kinetic energy Both cars have the same kinetic

Sound transfers energy through solid liquid and gas what does ocean waves transfer energy through is it water or water and air as evaporation

Why does it hurt your hands when you carry heavy shopping in carrier bags?

Why did scientists choose carbon as a base for the atomic mass unit? Which isotope of carbon did they use?

What organelle is found in all animal cells and some plant cells

Basic of Archimedes's principle of how fluid can make body to float and sink.

A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gun powder. What is the average force (in N) exerted on a 0.0500 kg bullet to accelerate it to a speed of 625 m/s in a time of 1.10 ms (milliseconds)