If a device uses 280 watts of power a day, about how many kilowatt-hours will it use in 30 days?

How much heat does it take to raise the temperature of 5.0 kg of plastic from 15°C to 75°C? The specific heat of plastic is 2.60 kJ / (kg•°C), Use Q = mc Tp-T). A. 300 kJ B. 780 kJ C. 196 kJ D. 980 kJ

A 1.5 kg cart traveling at 1.2 m/s hits and bounces off a 0.75 kg cart that was at rest. The 0.75 kg cart moves forward at 2.0 m/s. How fast does the first cart end up going?

Which interaction of nature binds neutrons and protons into nuclei? A. strong B. weak C. electromagnetic D. gravitational

The electroscope is an apparatus used to detect electric charge. The electroscope consists of a plate, a support and a free to rotate needle all made of metal.

a situation in which unbalanced forces are acting on an object. What is the net force on the object, and how does the net force change the motion of the object? 3. Identify the type of friction

Which have a positive charge? neutrons atoms protons electrons

Now that we know the velocity of the cart before the collision is 1.80m/s, let's use this to determine the linear momentum and kinetic energy of the disk-cart system before the collision. The mass of the cart is 23.5kg. The mass of the disk is 11.

A circuit is built based on the circuit diagram shown. A diagram of a closed circuit with a power source on the left labeled 60 V. There are 3 resistors in parallel, separate paths, connected to it labeled 40 Ohms, 50 Ohms and 30 Ohms.

After harvesting their main crops, such as corn and wheat, many farmers plant a second crop called a cover crop. This cover crop grows during the fall and winter and is then plowed over in the spring. What is the main purpose of a cover crop? A.

A light wave is traveling straight up out of the ocean then moves out into the air how do you expect the movement of the light wave to change the light wave will