Physics

Quickly spinning the handle of a hand generator, Kevan is able to light three bulbs in a circuit. When he uses two batteries instead of the generator, the bulbs are very dim. Which statement best explains why the batteries are not able to power all three light bulbs like the generator?a. The batteries do not make the charges move as muchb. The generator creates less voltagec. The batteries have higher amperaged. The generator current is more steady
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When white light passes through a glass prism, it separates out into different colors. Which of the following best explains why this happens?A. The light is circularly polarized, causing it to spread out when it passes through glass.B. Different wavelengths of visible light refract at different angles when passing from air to glass.C. The light passes through tiny holes in the molecules of glass, causing the light to diffract into different colors.D. White light causes a chemical reaction when it enters glass, causing the glass to emit different colors.
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The three classes of rocks are sedimentary, metamorphic, and igneous. How are rocks classified into one of these three groups?
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2. A sailor pushes a 100.0 kg crate up a ramp that is 3.00 m high and 5.00 m long onto the deck of a ship. Heexerts a 650.0 N force parallel to the ramp. What is the mechanical advantage of the ramp? What is theefficiency of the ramp? Your response should include all of your work and a free-body diagram.
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In a model ensemble system, what do meteorologists change each time they run a simulation of the same model?a) the predicted forecastB) the mathematical equations usedc) the initial conditionsD) the range of possible outcomes
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A charge of 12.6 C is at the geometric center of a cube. What is the electric flux through one of the faces? The permittivity of a vacuum is 8.85419 1012 C 2 /N m2 . Answer in units of N m2 /C.
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A bar extends perpendicularly from a vertical wall. The length of the bar is 2 m, and its mass is 10 kg. The free end of the rod is attached to a point on the wall by a light cable, which makes an angle of 30 with the bar. Find the tension in the cable.
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Click on the crate to bring it to a stop, then replace it with the refrigerator. Use the slider to apply a force of about 400 N. After 2 s have elapsed in the simulation, decrease the Applied Force (force exerted) slowly back to zero. Try to do this adjustment in roughly 2 s . While the Applied Force (force exerted) is decreasing, the velocity is:______.a. constant. b. increasing. c. decreasing.
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What is the normal condition for atoms? What is an excited atom? What are orbitals?
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A gry is an old English measure for length, defined as 1/10 of a line, where line is another old English measure for length, defined as 1/12 inch. A common measure for length in the publishing business is a point, defined as 1/72 inch. What is an area of 0.68 gry2 in points squared?
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An electron and a proton are separated by a distance of 1 m. What happens to the size of the force on the first electron if a second electron is placed next to the proton?
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A proton with a speed of 3.000105 m/s has a circular orbit just outside a uniformly charged sphere of radius 7.00 cm. What is the charge on the sphere?
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You and your roommate are moving to a city360 mi away. Your roommate drives a rental truck at a constant 50 mi/h , and you drive your car at 60 mi/h . The two of you begin the trip at the same instant. An hour after leaving, you decide to take a short break at a rest stop If you are planning to arrive at your destination a half hour before your roommate gets there, how long can you stay at the rest stop before resuming your drive?
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A 9-hp (shaft) pump is used to raise water to an elevation of 15 m. If the mechanical efficiency of the pump is 82 percent, determine the maximum volume flow rate of water. Take the density of water to be rho = 1000 kg/m3.
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Why did you measure 20 cycles of the pendulum motion to determine the period, rather than just one cycle?
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A student throws a set of keys vertically upward to her sorority sister, who is in a window 4.00 m above. The keys are caught 1.50 s later by the sister's outstretched hand. (a) With what initial velocity were the keys thrown?(b) What was the velocity of the keys just before they were caught?
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A certain five cent coin contains 5.00 g of nickel. What fraction of the nickel atoms' electrons, removed and placed 1.00 m above it, would support the weight of this coin? The atomic mass of nickel is 58.7, and each nickel atom contains 28 electrons and 28 protons. (answer in 10^{-11})
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The diffuser in a jet engine is designed to decrease the kinetic energy of the air entering the engine compressor without any work or heat interactions. Calculate the velocity at the exit of a diffuser when air at 100 kPa and 30C enters it with a velocity of 350 m/s and the exit state is 200 kPa and 90C.
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A 75 kg pilot flies a plane in a loop. At the top of the loop, where the plane is completelyupside down for an instant, the pilot hangs freely in the seat and does not push against theseat belt. The airspeed indicator reads 120 m/s. What is the radius of the planes loop?
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A piece of plastic tape coated with iron oxide is magnet- ized more in some parts than in others. When the tape is moved past a small coil of wire, what happens in the coil? What is a practical application of this?
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Suppose you throw a ball vertically upward with a speed of 49 m/s. Neglecting air friction, what would be the height of the ball be 2.0 second later?
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In which of the following conditions doesthe car not accelerate?A) A car moves at 80 km/h on a flat,straight highway.B) The car slows from 80 km/h to 35 km/hC) The car turns a corner.D) The car speeds up from 35 km/h to80 km/h.
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A fence post is 52.0 m from where you are standing, in a direction 37.0 north of east. A second fence post is due south from you. How far are you from the second post if the distance between the two posts is 68.0 m?
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A mass attached to a spring oscillates and completes 51 full cycles in 35 s. What is the time period (in s) and frequency (in Hz) of this system?
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