If two objects of different masses are dropped
near the Earth’s surface from the same height at
the same instant and air resistance is neglected,
we will find that
a)the downward acceleration of the two objects
must be quite different.
b) both objects will experience the same
gravitational force.
c) both objects will strike the ground at the same time.
d) the weight of both objects will be the same.
c
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A 10-g bullet moving horizontally with a speed of 2.0 km/s strikes and passes through a 4.0-kg block moving with a speed of 4.2 m/s in the opposite direction on a horizontal frictionless surface. If the block is brought to rest by the collision, what is the kinetic energy of the bullet as it emerges from the block?
a. 0.51 kJ b. 0.29 kJ c. 0.80 kJ d. 0.13 kJ e. 20 kJ
The biggest surprise from the New Horizons flyby of Pluto was learning that Pluto _________.
A. has an ice-rich composition B. is too small to be considered a planet C. shows clear evidence of recent or ongoing geological activity D. has a moon named Charon
The nearest star system to our Sun, Alpha Centauri, is still over a parsec distant
Indicate whether the statement is true or false
At a point in space where the magnetic field is measured, the magnetic field produced by a current element
a. points radially away in the direction from the current element to the point in space. b. points radially in the direction from the point in space towards the current element. c. points in a direction parallel to the current element. d. points in a direction parallel to but opposite in direction to the current element. e. points in a direction that is perpendicular to the current element and perpendicular to the radial direction.