An upward force of 18 N is applied via a string to lift a ball with a mass of 1.5 kg.

a) what is the net force acting upon the ball?

b) what is the acceleration of the ball?

The amount of gravitational potential energy released as an object falls depends on

Bjorn is holding a tennis ball outside a second floor window (3.5 meters from the ground) and billie jean is holding one outside a third floor window (6.

Calculate the energy needed to heat 4 kg of water from 25 degrees c to 45 degrees c

The intensity of light from a star varies inversely as the square of the distance. If you lived on a planet ten times farther away from the sun than the Earth, how would the light intensity of the sun compare with that on Earth?

When atoms get more and more energy, they can ionize. What can happen to a gas as more energy is added to its atoms? A. As the atoms move faster, the gas can change into a plasma. B. As the atoms move slower, the gas can change into a liquid. C.

Why oil does not dissolve in water?

Which element has the highest number of protons? a. Calcium b. Argon c. Xenon d. Radon

Which are the most common producers in aquatic ecosystems? a - bacteria b - algae c - fish d - plants

You push a piano 5 meters across the floor with a force of 400 n. how much work have you done?

Monochromatic electromagnetic radiation illuminates an area of a surface. The electric and magnetic fields of the waves are then doubled in magnitude.