Physics

a sky driver jumps from an aircraft. the mass of sky driver sky driver is 70kg. state the equation linking weight,mass,and gravitional field strenght.
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A motor is designed to operate on 117 V and draws a current of 17.7 A when it first starts up. At its normal operating speed, the motor draws a current of 2.78 A. Obtain (a) the resistance of the armature coil, (b) the back emf developed at normal speed, and (c) the current drawn by the motor at one-third normal speed.
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You are pulling a sled using a horizontal rpe, as shown in the diagram. The rope pulls the sled. exerting a force of 50 N to the right. The snow exerts a friction force of 30 N on the sled to the left. The mass of the sled is 50 kg.Please help me with this
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1. Estimate the buoyant force that air exerts on a man. (To do this, you can estimate his volume by knowing his weight and by assuming that his weight density is about equal to that of water. Assume his weight is 940 N.) answer in N2.On a perfect fall day, you are hovering at low altitude in a hot-air balloon, accelerated neither upward nor downward. The total weight of the balloon, including its load and the hot air in it, is 17000 N.(a) What is the weight of the displaced air? answer in N(b) What is the volume of the displaced air? answer in m^3
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Both of these questions are the same but their answers in the answer key are different. Why?
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In Young's double slit experiment, 402 nm light gives a fourth-order bright fringe at a certain location on a flat screen. What is the longest wavelength of visible light that would produce a dark fringe at the same location? Assume that the range of visible wavelengths extends from 380 to 750 nm.
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A 771.0-kg copper bar is melted in a smelter. The initial temperature of the copper is 300.0 K. How much heat must the smelter produce to completely melt the copper bar? For solid copper, the specific heat is 386 J/kg K, the heat of fusion is 205 kJ/kg, and the melting point is 1357 K.
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3 An un calibrated mercury in glass thermometer immersed in melting ice. The length of the mercury thread is 25 mm when the thermometer immersed in steam from pure water boiling under a pressure of 1 atmosphere the length of the thread is 200 mm what is the temperature in degree centigrade when the length of the thread is 95mm.
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A regulation soccer field for international play is a rectangle with a length between 100 m and a width between 64 m and 75 m. What are the smallest and largest areas that the field could be?
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signmentSavedHelpWhile an elevator of mass 984 kg moves downward, the tension in the supporting cable is a constant 7730 N. Between t= 0 and t=4.00 s, the elevator's displacement is 5.00 m downward. What is the elevator's speed at t= 4.00 s?m/s
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Determine the magnitude as well as direction of the electric field at point A, shown in the above figure. Given the value of k = 8.99 1012N/C.
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(This is for other people with this Question i hope you find this when you need help) Need answer for this Help!!! Question 7 of 20 You plan to use a slingshot to launch a ball that has a mass of 0.025 kg. You want the ball to accelerate straight toward your target at 19 m/s2. How much force do you need to apply to the ball? O A. 19.03 N OB. 0.48 N O C. 4.51 N D. 760.00 N
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what will be the effect on the acceleration due to gravity of the earth if it is compressed to a the size the moon?
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A. Tick (1) the best alternatives. 1. What is the acceleration due to gravity on the surface of moon ? (a) 9.8m/s (b)1.6m/s2 (c) 6.67x10-1m/s (d) 9.8m/s?
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list at least types of motion
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A 55kg bungee jumper has fallen far enough that her bungee cord is beginning to stretch and resist her downward motion . Find the ( magnitude and direction ) exerted on her by the bungee cord at an instant when her downward acceleration has a magnitude of 7.1m/s2
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A force of 10 N is making an angle of 30 with the horizontal. Its horizontal component will be:A. 4NB. 5NC. 7ND. 8.7 N
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Where is the center of mass of homogeneous body which has a regular
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What do you mean by unit?
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A 30-year-old astronaut goes off on a long-term mission in a spacecraft that travels at speeds close to that of light. The mission lasts exactly 20 years as measured on Earth. Biologically speaking, at the end of the mission, the astronaut's age would be:_______.a) exactly 50 years.b) exactly 25 years.c) exactly 30 years.d) less than 50 years.e) more than 50 years.
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A runner has a temperature of 40c and is giving off heat at the rate of 50cal/s (a) What is the rate of heat loss in watts? (b) How long will it take for this person's temperature to return to 37c if his mass is 90kg.
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What the velocity from the graph given above?
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A parallal capacitor consists of two Squere plates each of Side 25cm, 3. Omm apart. If a potential difference of 2000volts is applied, calculate the change in the plate with 1.air 2. paper of relative permittity 2.5, fully the space between them E=8.910^-12
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An electromagnetic wave has a frequency of 6.0 x 10^18 Hz. What is thewavelength of the wave? Use the equation 2 = and the speed of light as 3.0x 108 m/s.
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