A wiggle in time is a
A) vibration.
B) wave.
C) both of these
D) none of the above
Answer: A
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At what speed would a proton need to circle the Earth at a height of 1 000 km above the equator if the Earth's magnetic field is horizontal and directed north-south, with an intensity of 4.00 × 10?8 T? (The radius of the Earth is 6 400 km and the charge and mass of the proton are q = 1.60 × 10?19 C and mp = 1.67 × 10?27 kg. Ignore relativistic corrections.)
What will be an ideal response?
Approximately how many neutrinos pass through your body each second?
A) about 1023 B) about a thousand trillion C) about one thousand D) None; they are blocked by the Earth's atmosphere.
The graph shows the force on an object as it moves a distance x. What is the work done by the force when the object moves from 0.0 m to 10.0 m?
A. 34 J
B. 45 J
C. 52 J
D. 64 J
E. 75 J
A 46.0-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 225 N. For the first 11.0 m the floor is frictionless, and for the next 10.0 m the coefficient of friction is 0.20. What is the final speed of the crate after being pulled these 21.0 m?
What will be an ideal response?