Ultimate Physics Study Guide - Questions & Answers

a skater extends her arms horizontally, holding a 2 kg mass in each hand. she is rotating about a vertical axis with an angular velocity of 1 rev/s. if she pulls her hands in towards the center of her body, approximately what will the final angular velocity be if her own moment of inertia remains approximately constant at 5 kg m2, and the distance of the masses from the axis changes from 1 m to 0.2 m?
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what significant event occurred about 400,000 years after the big bang? a. the universe became transparent to radiation. b. the temperature of the radiation decreased to -600 k. c. all of the present galaxies in the universe were instantly formed.
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the man hanging upside down is holding a partner who weighs 565 n. assume that the partner moves on a circle that has a radius of 5.05 m. at a swinging speed of 6.66 m/s, what force must the man apply to his partner in the straight-down position?
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two people are on a train that is moving at 10 m/s north. they are walking 1 m/s south relative to the train. relative to the ground, their motion is 9 m/s north. why are we able to use these motions to describe the motion relative to the ground?
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a white pool ball (mass 0.17 kg) moving 13.2 m/s hits a red pool ball that is initially stationary and has a mass of 0.15 kg. the red ball gains a speed of 9 m/s to the right. what is the final velocity of the white ball, to the nearest 0.01 m/s?
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david's home uses a whopping 100 watts of phantom power (e.g. modem, 4 alexa's, router, printer, garage door, clocks, etc.). he is rather annoyed about this! how much is that costing him per year if his average electricity cost is $0.15 per kwh?
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what is the primary driver of creating wind on the surface of the earth? select one: a. earth's magnetic field b. uneven heating of earth's surface by the sun c. ocean currents d. the moons gravitational pull on the earth
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Rank these automobiles based on the magnitude of the impulse needed to stop them, from largest to smallest. Rank from largest to smallest. To rank items as equivalent, overlap them. If the ranking cannot be determined, check the box below. The correct ranking cannot be determined. Part C Rank the automobiles based on the magnitude of the force needed to stop them, from largest to smallest. Rank from largest to smallest. To rank items as equivalent, overlap them. If the ranking cannot be determined, check the box below. The correct ranking cannot be determined.
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A large water tank with cross sectional area A and height of h is filled to the top with water (density= rho). There is a hole of cross sectional area a located at the bottom of the tank. The velocity of the water exiting the small hole is
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You found that the unknown metal has a specific heat capacity close to, for example, that of silver (c=234J/(kg?K)). Let's compare silver to other known materials and see whether your results make sense. Imagine you have 1 kg of each of the substances listed below.If the same amount of heat Q is added to each, which substance will undergo the largest change in temperature ?T? Assume that no substance experiences a phase change.
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A heavy piece of hanging sculpture is suspended by a 90 cm long 5.0 g steel wire. When the wind blows hard, the wire hums at its fundamental frequency of 95 Hz.What is the mass of the sculpture?
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the figure shows two identical, initially uncharged conducting spheres. sphere b is grounded and sphere a is not grounded. a positively charged rod is brought close to but does not touch sphere a, as shown. the rod is then removed. a student claims that both spheres are now charged. is the student correct? why or why not?
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finley's pumpkin had a mass of 6.56.56, point, 5 kilograms (\text{kg})(kg)(, start text, k, g, end text, )before he carved it. after it was carved, the pumpkin had a mass of 3.9\,\text{kg}3.9kg3, point, 9, start text, k, g, end text. what was the percent decrease in the mass of the pumpkin?
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one cannot peer all the way back and directly observe the big bang because the universe's density was so low. true false
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according to the nebular theory, what are the basic steps in the formation of our solar system from first event to last?
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calculate the acceleration of a 250000- kgkg jumbo jet just before takeoff when the thrust on the aircraft is 80000 nn .
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a 5 kg bucket of water is raised from a well by a rope. if the upward acceleration of the bucket is 2.6 m/s2, find the force exerted by the rope on the bucket of water.
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a 97.5 kg bungee jumper jumps off a bridge and undergoes simple harmonic motion. if the period of oscillation is 11.2 s, what is the spring constant of the bungee cord?
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a small fish is subject to both a viscous force and a drag force from the water. if the fish swims twice as fast, what happens to these forces?
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at what temperature, in kelvins, will atoms of a monatomic gas have an average kinetic energy equal to this needed electrical potential energy?
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in the photoelectric experiments the current (number of electrons emitted per unit time) is proportional to the intensity of light. can this result alone be used to distinguish between the classical and quantum theories
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two particles oscillate in simple harmonic motion along a common straight-line segment of length a. each particle has a period of 1.5 s, but they differ in phase by p/6 rad. (a) how far apart are they (in terms of a) 0.50 s after the lagging particle leaves one end of the path? (b) are they then moving in the same direction, toward each other, or away from each other?
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upon reaching a downward velocity of 45 m/s, 300 newtons of drag resist the diver's motion. draw a force diagram for the skydiver. how large is the skydiver's acceleration?
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if light with a wavelength of 500 nm falls on a single slit with a width of 0.05 mm, what is the full width (between the first two dark fringes) of the resulting central diffraction peak seen on a screen 1.0 meters away?
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