A 30-N stone is dropped from a height of 10 m and strikes the ground with a speed of 13 m/s. What average force of air friction was exerted on the stone as it fell?
A) 4.1 N
B) 2.9 N
C) 0.13 kN
D) 7.2 N
E) 1.2 N
A
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The Paleozoic era ended and the Mesozoic era began about ______________ million years ago
Fill in the blank(s) with correct word
A 3.0-kg mass moving in the positive x direction with a speed of 10 m/s collides with a 6.0-kg mass initially at rest. After the collision, the speed of the 3.0-kg mass is 8.0 m/s, and its velocity vector makes an angle of 35° with the positive x axis. What is the magnitude of the velocity of the 6.0-kg mass after the collision?
a. 2.2 m/s b. 2.9 m/s c. 4.2 m/s d. 3.5 m/s e. 4.7 m/s
Which of the following is not a fundamental force?
a. the gravitational force b. the electromagnetic force c. the strong force d. the force of forward motion also known as the inertial force e. Choose this answer if two of the named forces are not fundamental.
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