A spaceship with a mass of 20,000 kg is traveling in a straight line at a constant speed of 300 km/s in deep space. Its rockets engines must be: (A) off or (B) firing?
A. off
B. firing
A. off
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Instantaneous speed and average speed are equal
a. always b. for motion at constant speed c. for accelerated motion d. never
A researcher is using x-rays to investigating a cubic crystal. He is looking at Bragg reflection from the planes parallel to the cube faces
He finds that when using x-rays with a wavelength of 0.165 nm, a strong first maximum occurs when the beam makes an angle of 23.5° with the planes. What is the spacing of adjacent atoms in this crystal?
Why would a hotter star appear blue-white while a cooler star appear red or not be visible at all?
What will be an ideal response?
A coil with a self-inductance of 6 H has a constant current of 2 A flowing through it for 2 seconds. What is the emf induced in this coil?
A) 6 V B) 12 V C) 0 V D) 4 V E) 8 V