If the braking distance for your car at a certain speed is 200 ft and, after reacting to a situation, you have managed to stop your car in 5.0 s, then the magnitude of the acceleration was
A. 16 ft/s2.
B. 25 ft/s2.
C. 50 ft/s2.
D. 32 ft/s2.
Answer: A
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The half-life of a radioactive element is the time it takes for:
A) half of the radioactive atoms to double themselves. B) half of the radioactive atoms to decay into isotopes. C) the radioactive atoms to increase by half of its initial quantity. D) the radioactive atoms to increase to 1.5 times of its initial quantity.
Time Dilation: A spaceship visits a star that is 4.5 light-years from Earth, and the spaceship travels at one-half the speed of light for the entire trip.(a) How long did the trip take according to an observer on Earth?(b) How long did the trip take according to an observer on the spaceship?
What will be an ideal response?
In order to determine the mass of a planet by applying Newton's laws of motion and gravity, the planet must have
A) rings. B) moons. C) a solid surface. D) a known size and distance from Earth. E) planets further from the Sun than itself.
A 2.0-kg block is projected down a plane that makes an angle of 20° with the horizontal with an initial kinetic energy of 2.0 J. If the coefficient of kinetic friction between the block and plane is 0.40, how far will the block slide down the plane before coming to rest?
a. 3.0 m b. 1.8 m c. 0.30 m d. 1.0 m e. 1.3 m