A battery with an emf of 12 V and an internal resistance of 1 Ω is used to charge a battery with an emfof 10 V and an internal resistance of 1 Ω. The current in the circuit is : A) 2 A B) 1 A C) 4A D) 11A E) 22 A

A thermometer is placed directly sunlight will it read the temperature of the air or of the sun or of something else?

You toss an apple from 5 m tree. The apple hits your head on the ground that is 7 m away from the tree. How fast did you throw the apple?

What average net force is required to accelerate a 9.5 g bullet from rest to 650 m/s over a distance of 0.85 m along the barrel of a rifle?

The graph shows the distribution of energy emitted by a star. Which is the best conclusion to draw about the star? a. It has a lower temperature than the Sun because its peak wavelength is longer than the Sun's. b.

Cheetahs, the fastest of the great cats, can reach 45 mph in 2.0 sec starting from rest. Assuming that they have constant acceleration throughout that time, find (a) their acceleration (in f t/s2 and m/s2) (b) the distance they travel during that

What are some examples of tools or objects that apply force?

You push a 45 kg wooden box across a wooden floor at a constant speed of 1.0 m/s. The coefficient of kinetic friction is 0.25. Now you double the force on the box. How long would it take for the velocity of the crate to double to 2.0 m/s

Why do you feel warm when you are standing away from a camp fire

A student in her physics lab measures the standing-wave modes of a tube. The lowest frequency that makes a resonance is 20 Hz. As the frequency is increased, the next resonance is at 60 Hz. What will be the next resonance after this? A. 80 Hz B.

For a satellite to stay in orbit around Earth, it has to be moving forward very fast all the time. What force will make it fall to Earth if it goes too slowly?