Physics

how do you select the appropriate tools for caregiving rated task effectively?
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Why must you bend forward when carrying aheavy load on your back?1. The gravitational force has decreased.2. Angular momentum has decreased.3. The center of gravity has shifted.4. Inertia has changed.
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Thomas helps his older brothers, who own a junk yard, on the weekends to earn extra money. He likes to help them push broken-down cars to the back of the junk yard because it makes him feel strong. Last Saturday, they pushed three cars with different weights, and he noticed he used different amounts of force for each one. The cars were the following weights:white car: 2,700 poundsred car: 1,500 poundsblue car: 2,100 poundsThink about how much force is needed to move each car. Which correctly organizes the cars in order from the most to least amount of force needed to move them
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Which of these statements are true about hydroelectric power? A.It is the most widely used renewable energy source in the world. B.It never disrupts ecosystems. C.It is not always available. D.A hydroelectric dam controls the force of moving water to generate electricity.
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A torque of 36.5 N m is applied to an initially motionless wheel which rotates around a fixed axis. This torque is the result of a directed force combined with a friction force. As a result of the applied torque the angular speed of the wheel increases from 0 to 10.3 rad/s. After 6.10 s the directed force is removed, and the wheel comes to rest 60.6 s later. (a) What is the wheel's moment of inertia (in kg m2)? kg m (b) What is the magnitude of the torque caused by friction (in N m)? N m (c) From the time the directed force is initially applied, how many revolutions does the wheel go through? ______ revolutions
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Sam has 3/4 of a can of the hot chocolate mix for drinks to keep everyonewarm. To make a cup of hot chocolate, Sam adds hot water to onescoop of hot chocolate mix. The scoop holds 1/24 of a can. How many cups of hot chocolate can Sam make?Speak fast
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Two solenoids of equal length are each made of 2000 turns of copper wire per meter. Solenoid I has a 5.00 cm radius; solenoid II a 10.0 cm radius. When equal currents are present in the two solenoids, the ratio of the magnitude of the magnetic field BIalong the axis of solenoid I to the magnitude of the magnetic field BIIalong the axis of solenoid II, BI/BII, is
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(b) The refractive index of the glass of the prism is 1.49. The ray EF is refracted at F. Useinformation from Fig. 6.1 to calculate the angle of refraction at F.ILangle of refraction[3]
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If you had pulled the box with 300W of power, and did 900J of work, how long did it take to pull the box?
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A toy gun uses a spring to shoot plastic balls (m = 50 g). The spring is compressed by 3.0 cm. Let k=2.22 105 N/m. (a) Of course, you have to do some work on the gun to arm it. How much work do you have to do? (b) Suppose you fire the gun horizontally. How fast does the ball leave the gun? (c) Now suppose you fire the gun straight upwards. How high does the ball go?
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A 60 cm tall Siberian Huskey stands 3 m in front of a PLANE MIRROR and looks at its image. a) How tall is the image in the mirror? b) What is the characteristic of the image?
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What is the difference between a positively and negatively charged object?
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A marble has a volume of 1 mL. How much water will it displace in a graduated cyclinder A. 1 mm B. more than 1 mL C. less than 1 mL D. 1mL
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Ways that waves may interact with matter include
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Which one of the statements below is true about mechanical waves?They must travel in empty space.They can travel in a vacuum.Both sound and light are examples of mechanical waves.They require a medium to travel through.
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Which one i need help
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plz answer the question in the image below (really its 8th grade science but they don't have that)
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Question 8: Unspooling Thread (100 points) A 110 g spool of thread with a 4.2 cm radius is held up by a peg through its center and allowed to freely rotate. Assume the thread is ideal (i.e., it does not stretch or slip, and its mass is negligibly small). A 160 g needle is tied to the loose end of the thread. The needle is dropped, and it accelerates to the floor as the thread unwinds. Find the tension in the thread and the magnitude of the acceleration of the needle as it falls.
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You observed the wheels of a car as it moves past you from right to left. Do the wheels have a positive or negative angular velocity?
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QUESTIONEnergy can only be used in it's originalform.falsetrue
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ActivityLaunch the Wave on a String simulation again to investigate the relationship between amplitude and damping force.To begin: Select Oscillate and No End. Set Amplitude to 1.00 cm and Frequency to 1.00 Hz, Set Damping to None and Tension to low. Select Rulers to measure the amplitude of the waves.For each measurement described below, pause the wave when the oscillator arm is at or just past its maximumPart AYou can see that each wave has a crest and a trough. Measure the amplitude at the first crest to the center of the ball and record your reading inthe table below. Record amplitude measurements for every subsequent trough and crest, as identified in the table.Finally, vary the Damping as indicated in the table and record your amplitude readings again for each different damping value to complete thetable. Each division is 5 units of dampening force, where None = 0, and Lots = 50.illustrationAmplitude of Wave 1 E Amplitude of Wave 2 Amplitude of Wave 3(crest)(crest)(crest)
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takes 5 seconds and 2,000 J for a crane to lift a very heavy object. Which of these correctly describes power and energy for this action?2,000 J of energy was converted into some other energy, requiring 10,000 W of power.2,000 J of energy was converted into some other energy each second, requiring 400 W of power2,000 J of power was converted into 400 W of energy.2,000 J of power was converted into some other power every second, requiring 10,000 W of energy.
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Waves that move through space are called
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PLS HELP MESecondary waves CANNOT travel througha.rock.b.liquids.c.Earths mantle.d.Earths crust.
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