According to modern science, which of the following best explains why the vast majority of the mass of our solar system consists of hydrogen and helium gas?
A) Hydrogen and helium are the most common elements throughout the universe.
B) Gravity only acted on hydrogen and helium.
C) All the elements besides hydrogen and helium escaped from the solar nebula before the Sun and planets formed.
D) All elements besides hydrogen and helium were swept out of the solar system by the solar wind.
A) Hydrogen and helium are the most common elements throughout the universe.
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A speeding car is traveling at a constant 30.0 m/s when it passes a stationary police car
If the police car delays for 1.00 s before starting, what must be the magnitude of the constant acceleration of the police car to catch the speeding car after the police car travels a distance of 300 m? A) 6.00 m/s2 B) 3.00 m/s2 C) 7.41 m/s2 D) 1.45 m/s2 E) 3.70 m/s2
A 600-kg car traveling at 30.0 m/s is going around a curve having a radius of 120 m that is banked at an angle of 25.0°. The coefficient of static friction between the car's tires and the road is 0.300
What is the magnitude of the force exerted by friction on the car? A) 1590 N B) 3430 N C) 7240 N D) 7820 N E) 795 N
The half-life of a muon is 2.20 ?s as measured in a stationary reference frame. What is the half life of the muon (in ?s) when it is moving with a speed of v = 0.800 c?
a. 8.13 b. 2.75 c. 3.67 d. 15.8 e. 1.32
Three identical point charges (+2.0 nC) are placed at the corners of an equilateral triangle with sides of 2.0-m length. If the electric potential is taken to be zero at infinity, what is the potential at the midpoint of any one of the sides of the triangle?
a. 16 V b. 10 V c. 70 V d. 46 V e. 44 V