Physics

Need help with this question. Thirty points.
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A boy stands 190m from a high wall and claps his hands,if he hears an echo 1.3 seconds later. calculate the speed of sound in air.
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A plant is sitting on a table.What, if any, forces are acting on the plant? (If there are forces acting on theplant, include what direction they are acting.)1 - Gravity (down)11- Static Friction111 - Normal (support) Force (up)IV - Air Resistance to the left)V - Applied Force (to the right)
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Which concept is exemplified by being able to distinguish a slight change in light when a dimmer is used to adjust the brightness
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A student measures the voltage and current between two points in anelectrical circuit. If the voltage is 120 V and the current is 0.5 A, what is theresistance, according to Ohm's law?A. 0.00402. 240 C. 1200D. 60.00
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Explain why electromagnetic forces are essential to forming compounds.
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A satellite with a mass of 45 kg fires its rocket thrusters, which give an impulse of 1035 kgm/s. What was the total change in the velocity of the satellite - that is, what was the total V?O 58 m/sO 23 m/sO 39 m/sO 47 m/s
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[tex] \text \red { \huge\underline{Question}}[/tex][tex] \text{What is ideal-gas equation?}[/tex]
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state ohm's law and prove V=ir
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Differentiate between transverse wave and longitudinal wave
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5)A 0.50 kg hockey puck is at rest on ice when you hit it with a hockey stick, applying a force of 100 N for0.10 seconds. The puck then slides across the ice, where the coefficient of kinetic friction is 0.20. Aftersliding for 4 seconds, the puck collides with a 0.80 kg box of donuts. The puck immediately comes to restafter the collision. How far will the box of donuts slide before coming to rest if the coefficient of frictionbetween the box and the ice is 0.30.
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At what distance does the electric field produced by a charge of -15 c have a magnitude equal to 8. 7104n/c?
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Why do you think we need evidence to be able to continually test theories about the composition and origin of our solar system and galaxies?
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How can we make a simple energy flow diagram to show the heat transfer between animals, heat lamps and environment?
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Use F = 1/T as your basis: 7. What is the period of 60.0Hz electrical power?The answer is 16.7 ms but please show your work.
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The SI unit for weight is ________.A. massB. kilogramC. newtonD. acceleration of gravityE. weight
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1. manganese dioxide is used in dey cell . ( Give reason)2. Fuses are used in a circuit. ( Give reason )
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The frictional force between two surfaces at rest depends on which of the following?
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An object absorbs red, orange, yellow, blue, indigo, and violet light. What color is it?A. blueB. greenC. indigoD. red
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A drum is struck, producing a wave with a wavelength of 110 cm and a speed of 2.42 104 m/s. What is the frequency of the wave? What is the period?
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If interstellar gas has a density of 1 atom/cm3, how big a volume of material must be used to make a star with the mass of the Sun
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Does sound travel faster through stiffer objects yes or no and explain why?
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Is the following sentence true or false? When two surfaces rub, the irreg-ularities of one surface get caught on those of the other surface.
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A circular ferris wheel that revolves at a constant rate once every 30 seconds. Theradius of the ferris wheel is 10 m. What is the normal force of the ferris wheel on a 10kg toddler at the very bottom of the ferris wheel?
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