What statement did Niels Bohr make about atoms?

A 0.1 kg beach ball hit me moving forward at 4 m/s. After hitting me, it bounced back moving at the same speed backward. What impulse acted on the beach ball? A 40 N-s B. 0.8 Ns C. 0.4 N-s D. 80 N-s

Sam is riding his bike in the park when he sees a soccer ball rolling toward him. He applies his brakes to slow down. Once he stops, he notices that the tires on his bike became warmer after he applied the brakes.

Which statement describes the difference between speed and velocity a. Velocity is speed with a direction. B. Velocity is speed divided by time. C. Velocity is speed multiplied by time. D.

Find the volume of a box measuring 2 cm by 7 cm by 3 cm.

A 5.00 L volume of methane gas is cooled from 298 K to 149 K. If the pressure remains constant, what is the final volume in liters?

What property of sound enables us to distinguish one sound source from another?

The table below shows the right ascensions of two stars at a location. Star 1 - 4 right ascension (in Hour) Star 2 - 3 right ascension (in Hour) Which of these statements is correct about the stars?

H-2 + H-3 → He-4 + Consider the nuclear reaction that takes place in the sun. Two nuclides of hydrogen fuse to form helium. Is helium the only product of this reaction? If no, identify any additional products. A) Yes, He-4 is the only product. B) No.

Hat is a scientific theory? Make up your own scientific theory.

Which of the following is an example of a velocity? O A. 12 m/s O B. 45 km/hr south O C. 55 km/hr D. - 5 m/s2 east