What happens when two forces act in the same direction?
A. They cancel each other out.
B. They are added together.
C. They are subtracted.
D. Their sum divided by two is the total force.
Answer: B. They are added together.
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If you toss a ball straight upward at 40 m/s with no air resistance, one second after it reaches the top of its path its speed is
A) zero. B) 10 m/s. C) 20 m/s. D) 30 m/s E) 40 m/s.
According to the special theory of relativity, if a 35 year old astronaut sent on a space mission is accelerated to speeds close to that of light, and then returns to Earth after 20 years as measured on earth, what would be his biological age upon returning?
a. less than 55 years c. exactly 110 years b. more than 55 years d. 55 years
In a certain particle accelerator, a proton reaches an acceleration of 9.0 × 1013 m/s2. The mass of a proton is 1.67 × 10-27 kg. What is the force on the proton?
What will be an ideal response?
When a fixed amount of ideal gas goes through an isothermal expansion
A) its internal (thermal) energy does not change. B) the gas does no work. C) no heat enters or leaves the gas. D) its temperature must decrease. E) its pressure must increase.