Find the average density of a red giant star with a mass of 20 × 10^30 kg (approximately 10 solar masses) and a radius of 150 × 10^9 m (equal to the Earth's distance from the sun)
a. 1.41 × 10^?4 kg/m3
b. 0.007 kg/m3
c. 1.41 kg/m3
d. 710 kg/m3
e. 1.41 × 10^?3 kg/m3
e
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Shear Modulus: Two blocks are made of the same material, but one has twice the volume of the other block. Which block will have the greater shear modulus?
A. It will be the same for both of them. B. the larger one C. the smaller one
A 320-g air track cart traveling at 1.25 m/s suddenly collides elastically with a stationary 270-g cart. What is the speed of the 270-g cart just after the collision?
A) 0.678 m/s B) 0.106 m/s C) 1.36 m/s D) 1.14 m/s E) 2.72 m/s
In the context of the Sun's surface glowing when hot, yellow-hot is hotter than red-hot but not as hot as white-hot
Indicate whether the statement is true or false
A hydrogen atom consists of a proton and an electron. If the orbital radius of the electron increases, the electric potential energy of the electron-proton system
A) increases. B) decreases. C) remains the same. D) depends on the zero point of the potential.