Master Physics with Fun Quizzes & Brain Teasers!

PROBLEM SOLVING1. An electron is traveling to the north with a speed of 3. 5 x 106 m/s when a magnetic field is turned on. The strength of the magnetic field is 0. 030 T, and it is directed to the left. What will be the direction and magnitude of the magnetic force?2. The Earth's magnetic field is approximately 5. 9 10-5 T. If an electron is travelling perpendicular to the field at 2. 0 105 m/s, what is the magnetic force on the electron?3. A charged particle of q=4C moves through a uniform magnetic field of B=100 F with velocity 2 x 103 m/s. The angle between 30o. Find the magnitude of the force acting on the charge. 4. A circular loop of area 5 x 10-2m2 rotates in a uniform magnetic field of 0. 2 T. If the loop rotates about its diameter which is perpendicular to the magnetic field, what will be the magnetic flux?
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1. Fish are hung on a spring scale to determine their mass (most fishermen feel no obligation to truthfully report the mass). (a) What is the force constant of the spring in such a scale if it the spring stretches 8. 00 cm for a 10. 0 kg load?(b) What is the mass of a fish that stretches the spring 5. 50 cm?(c) How far apart are the half-kilogram marks on the scale?Please include all of your steps
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2. A woman lifts up a laundry basket 1. 5m and carries it 20m across the room. This takes 15s. Work is done on the laundry basket_*(20 Points)in walking across the roomduring the entire 15swork is not donein lifting the basket
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Diode-fare semiconductor devices. Diodes only allow a current to pass in one direction in a circuit (forward direction). The potential difference (p. D. ) at which the diode will allow a current to pass in thecircuit is called the threshold p. D. Write a plan to find the threshold p. D. And its direction to enable a current to pass. Your plan should include the following details:a hypothesisselection and justification of equipment, techniques or standard procedureshealth and safety associated with the investigationmethods for data collection and analysis to test the hypothesis including:the quantities to be measuredthe number and range of measurements to be takenhow equipment may be usedcontrol variablesbrief method for data collection analysis.
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A crane in a marble quarry is mounted on the rock walls of the quarry and is supporting a 2000 kg slab of marble. The center of mass of the 900 kg boom is located one-third of the way from the pivot end of its 15-m length, and the cable supporting the boom is attached at 10. 0 m from the pivot end. What is the tension in the cable supporting the boom? g
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Andrew was running late for class and could only find a parking space next to the golf course. His new truck was hit by a 0. 300 kg golf ball which left a 0. 400 cm dent in the hood. The golf ball was falling with a velocity of 8. 00 m/s. a) What is the initial momentum of the golf ball? b) what average force did the hood of the truck exert on the ball to stop it? c) how long did it take for the hood to stop the ball?
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An ungraduated mercury thermometer 'Q" attached to millimeter scale reads 22. 8mm in ice and 252. 4mm in steam at standard pressure. What will it read on a day when temperature is 30 F
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7. You are handed two mystery materials and told to determine which one acceptsnegative charges more easily. Using a positively charged, helium-filled balloon that istied to a tabletop with a 1 m long string, describe a simple experiment that will help youidentify the more attractive material.
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What is the velocity of a soccer ball in meters per second (m/s) with a mass of 1.0 kg that is kicked from rest if the coefficient of restitution between the ball and the foot is 0.48? the initial velocity of the foot is 16.1 m/s and has a mass of 7.8 kg.
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Choose the correct statement describing, what will you see if you look at them with a telescope that has an angular resolution of 0. 5 arcsecond
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Primary and secondary succession comic strip using succession interactive
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A ball drops some distance through the air, gaining 20 j of kinetic energy while experiencing some air resistance. how much gravitational potential energy did the ball lose
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A cat runs along a straight line (the x-axis) from point A to point B to point C, as shown in the figure. The distance between points A and C is 5. 00 m, the distance between points B and C is 10. 0 m, and the positive direction of the x-axis points to the right. The time to run from A to B is 20. 0 s, and the time from B to C is 8. 00 s. As the cat runs along the x-axis between points A and C what is its average speed?
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What is the frequency of red light, which has a wavelength of around 6. 35 * 10 ^ 7 - 7 m? (Remember: speed of light is 3*10^ 1 8 m/s) Be sure to show all work
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(b) The volume of the cylinder is 0. 0020m". The pressure inside the cylinder isinitially 200 atmospheres. When the cylinder is connected to the balloon, the finalpressure in the cylinder and the balloon is 1. 0 atmosphere. The temperature of thegas remains constant. Calculate the final volume of gas in the balloon. State theequation that you use.
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A rock is at the edge of a bluff and weighs 22n. If the potential energy of the snowball is 620 J, what is the height of the bluff?
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A constant-pressure R-134a vapor separation unit separates the liquid and vapor portions of a saturated mixture into two separate outlet streams. Determine the flow power needed to pass 5. 8 L/s of R-134a at 320 kPa and 55 percent quality through this unit. What is the mass flow rate, in kg/s, of the two outlet streams
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A spaceship measures bright flashes of light from a distant star. The spacecraft now heads toward the star at 0. 90c. From the spacecraft's point of view, at what speed do the pulses approach? Express your answer with the appropriate units
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Using the PhET Balancing Act, discuss the possibilities of balancing two forces acting on one side of a pivot point with a single force of the other. Select the best answer: i. This is possible with a single force at the same distance from the pivot point but on the opposite side of the pivot point as one of the forces. Ii. This is possible with a single force at the same distance as the point half way between the two forces from the pivot point but on the opposite side of the pivot point. Iii. This requires two forces. A
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Four identical particles of mass 0. 913 kg each are placed at the vertices of a 4. 30 m x 4. 30 m square and held there by four massless rods, which form the sides of the square. What is the rotational inertia of this rigid body about an axis that: a. Passes through the midpoints of opposite sides and lies in the plane of the squareb passes through the midpoint of one of the sides and is perpendicular to the plane of the squarec. Lies in the plane of the square and passes through two diagonally opposite particles
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A cubic container is at rest on a rough horizontal warehouse floor. if the mass of the container is 60.6 kg and the coefficient of static friction is 0.570, determine the minimum horizontal force that must be applied to the top of the container to cause tipping.
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How much force is required to pull a spring 0.412 m from its equilibrium position ifthe spring constant is 2,441.5 n/m?
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A 52. 0 kg diver jumps off a diving board with an upward velocity of 1. 7 m/s. The diving board bounces off a spring with a spring constant of 4100 N/m. Ignore her horizontal velocity. How far did the diver compress the spring in order to achieve her initial upward velocity?
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A structural plate component of an engineering design must support 207 mpa in tension. If an aluminum alloy is used for this application, what is the largest internal flaw size that this material can support? assume the shape factor is 1 and that for aluminum kic = 25. 6 mpam and yield strength is 455 mpa
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