8. A sprinter on a school track team is running north at a velocity of 6.0 m/s. After 5.0 s, she

is running south at 4.0 m/s. Calculate the average acceleration for this interval.

A closed system of mass 10 kg undergoes a process during which there is energy transfer by work from the system of 0.147 kJ per kg, an elevation decrease of 50 m, and an increase in velocity from 15 m/s to 30 m/s.

A microwave works by focusing microwave light on the food inside of it. Which type of energy transformation takes place in a microwave? A. Heat energy is transformed into electrical energy. B. Light energy is transformed into electrical energy. C.

What will be able to maintain temperature better: conductors or insulators?

A particle had a velocity of 19 m/s in the positive x direction and 2.5 s later its velocity was 35 m/s in the opposite direction. What was the average acceleration of the particle during this 2.5 s interval?

Which of the following statements are true? Check all that apply. A voltmeter is used to measure voltage. A voltmeter has a small internal resistance. A voltmeter must be placed in parallel with a resistor to measure the voltage across the resistor.

Two very small spheres are initially neutral and separated by a distance of 0.30 m. Suppose that 2.50 1013 electrons are removed from one sphere and placed on the other. (a) What is the magnitude of the electrostatic force that acts on each sphere?

Why is it important to balance a chemical equation? A. It is not important to balance a chemical equal B. To make sure you have the correct products C. To make sure you have the correct reactants D. To obey the law of conservation of mass

The presence of icicles hanging off the eaves of a wood-framed structure is most likely due to: heavy snow followed by a thaw. improper insulation in wall cavities. use of a poor-quality roof sheathing material. lack of proper roof ventilation.

Both gravitational potential energy and kinetic energy depend on

How much work is done when a 105 g tomato is lifted 19.2 m?