Physics

if an object measures to be 80 centimeters in length, then it is equivalent to ____
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On Monday, Sylvester walked up 50 stairs in 1 minute. On Tuesday, Sylvester walked up 100 stairs in 2 minutes. Which best describes Sylvester's work and power? a.He did equal work and used equal power on both days. b.He did equal work both days, but used more power on Tuesday. c.He did more work on Tuesday, and used more power on Tuesday. d.He did more work on Tuesday, but used equal power on both days.
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A physics student tossed a ball vertically straight upward.Describe the magnitude of the balls vertical velocity at its highest position.a. The magnitude of vertical velocity is zero.b. The magnitude of vertical velocity is 9.8 m/s.c. The magnitude of vertical velocity is at a maximum value.d. The magnitude of vertical velocity cannot be determined.
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What is the frequency of a wave that has a period of 5 seconds?O A. 2 HzOB. 5 HZO C. 20 HzO D. 0.2 Hz
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1. If all other things remain equal, which of the following changes to a closed circuit would result in increased resistance to the flow of electric current?Correct Answer: A) Reducing the thickness of the conductorB) Replacing the conductor with a more conductive materialIncorrect Response: C) Reducing the length of the conductorD) Reducing the temperature of the conductor 2. What term refers to producing magnetism by placing a body within a magnetic field?A) PolarizationB) Natural magnetismC) Incorrect Response: Artificial magnetismD) Correct Answer: Induced magnetism3. What two things must exist for an electric current to be produced?A) A negatively charged electrode and a positively charged electrodeB) Incorrect Response: A pair of highly conductive materials and a conducting path between themC) Correct Answer: An electric potential between two bodies and a conducting path joining the bodiesD) A source of voltage and an open circuit4. If all other things remain equal, which of the following changes to a closed circuit would result in increased resistance to the flow of electric current?A) Correct Answer: Reducing the thickness of the conductorB) Replacing the conductor with a more conductive materialC) Incorrect Response: Reducing the length of the conductorD) Reducing the temperature of the conductor5. Three components in a parallel circuit have individual resistances of r1, r2, and r3. What formula can you use to determine the total resistance of the circuit?A) 1/R= r1 + r2 + r3B) Incorrect Response: R= 1/r1 + 1/r2 + 1/r3C) Correct Answer: 1/R= 1/r1 + 1/r2 + 1/r3D) R= r1 + r2 + r36. Which of the following materials commonly used in electronic devices is classified as a semiconductor?A) Correct Answer: SiliconB) Incorrect Response: CopperC) GlassD) Plastic7. Which of the following explains why your hair stands on end when you rub it with a balloon?A) The balloon creates friction, which sticks your hair to it.B) Correct Answer: Electrons from your hair jump to the balloon, causing it to become negatively charged on one side.C) Incorrect Response: Protons from your hair jump to the balloon, causing it to become negatively charged on one side.D) Protons from the balloon jump to your hair, causing it to become negatively charged.
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a persons acceleration is 8m/s^2 from 2 seconds to 10 seconds, what is their change velocity?
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a single frictionless roller coaster car of mass m=750 kg tops the first hill with speed v=15 m/s ar height h =40m as shown 1) Find the speed of the car at B and C 2) if mass m were doubled, would the speed at B increase, decrease, or remain the same?
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All students perceive poor grades as disappointing.Please select the best answer from the choices providedF
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An air bubble is at a depth of 3 m belowthe surface of lake. What is the pressureof water on the air bubble?(take density of water = 1000 kgm )
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Which of the following are examples ofmolecules? Check all that apply.two carbon atoms bonded to each othera carbon atoma chain of one hundred carbon atoms bondedto one anothera carbon atom bonded to an oxygen atom
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A ball is thrown horizontally from a 11 m high building with a speed of 9.0 m/s.How far from the base of the building does the ball hit the ground?Express the answer using two significant figures.
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If the total age of three brothers Jack Sam and DeMarco is 33 what are the ages of the boys if Sam is half of the age of Jack and DiMarco is two years younger than Jack
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A cricket stump has a sharp point at one end use the words force area or pressure
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A storm is moving east toward your house at an average speed of 35 km an hour if the storm is currently 80 km from your house and how much time do you expect it to arrive
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Explain the quantization of energy.
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Add the following vectors:(a) (12, 5) + (6, 3)(b) (3, 8) + (6, 2)(c) (3, 8, 7) + (7, 2, 17)(d) (a, b, c) + (d, e, f)
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A 100 kg disc with radius 1.6 m is spinning horizontally at 25 rad/s. You place a 20 kg brick quickly and gently on the disc so that it sticks to the edge of the disc. Determine the final angular speed of the disc-brick system.
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Which of these consumers is an herbivore? * 1. lion2. deer3. spider4. snake
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Which of the following is a characteristic of electromagnetic waves?A: they are all visible B: they have a purely particle natureC: they can travel with or without a mediumD: they cannot travel very fast
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