1. Two masses are released at the same height, and fall a very long distance under gravity, till they hit the ground. The masses are subject to air friction, which you should assume has the form —b17 for both masses, even if this mathematical form is not very accurate. Mass A is made of lead. Mass B is made of a much less dense plastic. Both masses have the same size and shape, and therefore have the same friction coefficient b. Which one reaches the ground l ﬁrst?
(A) They both reach the ground at the same time.
(B) Mass B reaches the ground ﬁrst.
(C) Mass A reaches the ground ﬁrst.

2. A mass is thrown upwards on the earth, with an initial velocity vo. It reaches some maximum height he. (Ignore air friction.) The experiment is repeated on the Moon with the same mass and the same 110, and the mass reaches a different height hm, because the acceleration of gravity on the Moon is ~ 1/6 that on the earth. In these two experiments, the potential energy at the maximum height is, respectively, U8 and Um. What is the relationship between U6 and Um?
(A) Ue : Um
(B) U6 = /§Um
(C) Ue = 6Um
(D) Ue = %Um
(E) U6 = §Um
(F) Ue = 36Um

3. A 1 kg projectile is ﬁred (on Earth) with a speed of 10 rn/ s, at an angle 60° above the horizontal. It is subject to gravity, but not friction. Which of the following is the best estimate of its speed when it reaches a point 3 meters higher than the initial position?
A) 8.5 m/s
B) 6.3 m/s
C) 2.0 m/s
D) 1.1 m/s

A 4.0 kg toboggan rests on a frictionless icy surface, and a 2.0 kg block rests
on top of the toboggan. The coefficient of static friction µs between the block
and the surface of the toboggan is 0.58, whereas the kinetic friction
16.T op
coefficient is 0.48. The block is pulled by a horizontal force of 30 N as shown.
a. Ca

Rutheford successfully used classicalmechanics to account for the scattering pattern of alpha particles by heavy nuclei: he treated the alpha particle as a point mass that follows a hyperbolic trajectory under the repulsion of a ﬁxed point nucleus. But the de Broglie view of the wave nature of particles raises some awkward qu

Please help me with these problems. Thank you.
Position probability distribution for a pendulum. Consider the classical motion of a pendulum bob which, for small amplitudes of oscillation, moves effectively as a harmonic oscillator along a horizontal axis according to the equation.
x(t) = Asinwt
The probability that the b

1. You are loading a spring loaded dart gun and do an amount of work W such that the spring is only 1/3 compressed. How much additional work must you do to fully compress it from 1/3 to fully compressed? Answer in terms of W.
2. A large man tosses a small child onto a large pile of leaves. During the toss, the man exerts ___

Find the orbital speed of a satellite in a circular orbit 1870 km above the surface of the Earth.
1870km = 1.87e6 m
I tried using the V^2=GMe/r and came up with 14.6 km/s which is wrong.
I tried finding the velocity of earth 7.91 km/s and subtracting from the 14.6 km/s and still the answer is wrong.
Am I using th

1. Starting with the left-most column, populate the boxes from left to right without skipping empty boxes. Ties should be grouped in the same box. Rank the magnitude of a given particle's average acceleration, from smallest to largest, as interpreted from the following velocity vs. time graphs describing motion.
2. Displacem

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11. The angular speed of a wheel increases at a constant rate of 1.5 rad/s2. During a certain 3.2 s time interval, it makes four complete revolutions. If the wheel started from rest, how long has it been in motion at the start of this time interval?
12. An airplane makes a circular turn

This problem is to be considered as a tree diagram.
Directions: Consider below the branching tree diagram based on the number per 3000 American adults.
1500 Americans who 635 Democrats 293 mens
like classical music 342 women
per 3000 adults