A 2.0-kg block slides on a frictionless 15° inclined plane. A force acting parallel to the incline is applied to the block. The acceleration of the block is 1.5 m/s2 down the incline. What is the applied force?
a. 8.1 N down the incline
b. 3.0 N down the incline
c. 2.1 N up the incline
d. 3.0 N up the incline
e. 8.1 N up the incline
c
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The strong force is the force that
a. binds electrons to the nucleus in an atom. b. holds the Moon in orbit around Earth. c. creates the magnetic field associated with sunspots. d. produces the extremely high temperatures in the solar corona. e. binds protons and neutrons together to form a nucleus.
If the headlights on a car are separated by 1.3 m, how far down the road can they be resolved if the angular resolution of the eye is 5.0 × 10-4 rad and the person has excellent vision?
A) 1.3 km B) 5.0 km C) 4.8 km D) 0.65 km E) 2.6 km
The sources of both X-rays and gamma rays are
A) electron clouds. B) the atomic nucleus. C) both of these D) neither of these
Apart from its distance from its parent star, what is the next most important factor that determines a planet's habitability?
A) whether it has a large moon B) the size of the planet C) the chemical composition of its atmosphere D) the chemical composition of its surface