Isaac tosses a twig into a river to figure out how quickly the water is flowing. He observes that the twig travels 21 meters south in three seconds. Based on his observations, what is the velocity of the twig?

At what age can a person begin taking actions that will reduce the risk of dementia

A coiled up wire carrying a current is called what?

An object that is moving will stop moving when A. something pushes or pulls it to a stop. B. it has stopped speeding up. C. the force that is making it move stops pushing it. D. it has used up all its momentum.

You pull your sled through the snow a distance of 500 meters with a horizontal force of 200 newtons. How much work did you do?

A rope exerts a 280 N force while pulling an 80 Kg skier upward along a hill inclined at 12o. The rope pulls parallel to the hill. The coefficient of friction between the skier and the hill is 0.15.

Question 1 [7] Hydrogen gas is used in a Carnot cycle having an efficiency of 60% with a low temperature of 300K. During the heat rejection the pressure changes from 90 kPa to 120 kPa.

Technician A says a pull to the right during braking could be caused by a defective metering valve. Technician B says a pull to the left could be caused by a defective proportioning valve. Which technician is correct

Can Radiation transfers energy by moving matter.

Which of the following decreases the dissolving rate of a solid in water?

Why might a plant that normally grows in one environment not grow well in a different environment?