which of the materials would be able to scratch Quartz

You stand sideways in a moving train. Estimate how far apart you should keep your feet so that when the train accelerates at 3.2 m/s2 you can still stand without holding anything. Let d be the distance of separation between your feet, and h = 0.

What is another galaxy we know about?

A boy Is it running with a kinetic energy of 810 J. If the boy has a mass of 80 kg what is his speed

In order to remove water from a flooded basement, two pumps, each rated at 45 gallons per minute, are used. After half an hour, the one pump burns out, and the second pump finishes removing the water half an hour later.

Electromagnetic and mechanical waves both transfer energy. How is an electromagnetic wave different from a mechanical wave? Question 4 options: a. An electromagnetic wave has frequency, and a mechanical wave does not. b.

Which statement best compares the accelerations of two objects in free fall? O The heavier object has a greater acceleration.

A series RCL circuit includes a resistance of 280, an inductive reactance of 508, and a capacitive reactance of 315. The current in the circuit is 0.312 A.

A ray in benzene has a critical angle of 41.8 deg when trying to enter air. What is the index of refraction for benzene?

An elevator has mass 600 kg, not including passengers. the elevator is designed to ascend, at constant speed, a vertical distance of 20.0 m (five floors) in 16.0 s, and it is driven by a motor that can provide up to 40 hp to the elevator.

When two objects collide and stick together, what will happen to their speed, assuming momentum is conserved? They will move at the same velocity as whichever object was fastest initially.