A 1.6kg block of ice is being pulled to the left with a force of 14N at an angle of 30º above the horizontal. Assume that friction is negligible (that it is so small you can ignore it). What is the normal force? What is the acceleration of the block?

On a cold day, when the air temperature is 0°c, you empty your lungs and take a deep breath, filling your lungs with 4.2 l of air. if you hold your breath until the temperature of the air in your lungs reaches 37°c, what is the volume of the air in your lungs at that point, assuming the pressure does not change?

Identify the arrows that show the correct direction of heat transfer. 66°f 112°f 98°f

When you drop a pebble from height a it reaches the ground with speed v if there is no air resistance. from what height should you drop it so it will reach the ground with three times the speed? (a) 9m (b) 3m (c) 6m (d) 18m