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- An astronaut’s pack weighs 17.5 N when she is on the earth butonly 3.24 N when she is at the surface of a moon. What is the acceleration due to gravity on this moon?The fire alarm goes off, and a 97-kg fireman slides 3.0 m down a poleto the ground floor. Suppose the fireman starts from rest, slides withconstant acceleration, and reaches the ground floor in 1.2 s. What wasthe upward force F>exerted by the pole on the fireman?At the surface of Jupiter’s moon Io, the acceleration due togravity is g = 1.81 m/s2. A watermelon weighs 44.0 N at the surface ofthe earth What is the watermelon’s mass on the earth’s surface?
- A soccer player starts from rest and accelerates forward, reaching a velocity of 8.00 m/s in 2.50 s. (a) What was his average acceleration? (b) What average force did he exert backward on the ground to achieve this acceleration? The player’s mass is 70.0 kg, and air resistance is negligible.Since astronauts in orbit are apparently weightless, a clever method of measuring their masses is needed to monitor their mass gains or losses to adjust diets. One way to do this is to exert a known force on an astronaut and measure the acceleration produced. Suppose a net external force of 57.5 N is exerted and the astronaut's acceleration is measured to be 0.880 m/s². Calculate her mass (in kg). kg By exerting a force on the astronaut, the vehicle in which they orbit experiences an equal and opposite force. Discuss how this would affect the measurement of the astronaut's acceleration. Propose a method in which recoil of the vehicle is avoided.An igneous rock has a mass of 5 Kg. What is its weight on the moon, where the acceleration due to gravity is one sixth that on Earth? What is ist weight in Jupiter, where the acceleration due to gravity is 2.64 times that on Earth?
- a 1525-kg sports car accelerates from rest to 96.5-km/h in 5.92s what magnitude force does a 66.8kg passenger experience during this acceleration?What magnitude net force is requred to accelerate to a 1200-kg car uniformly from 0 m/s to 27.0 m/s in 10.0 s?A decorative light fixture in an elevator includes a 1.7 kg light suspended by acable from the ceiling of the elevator. At the bottom of this light, a second cablesuspends another 0.40 kg light. The elevator is moving downward at 3.6 m/s whensomeone presses the emergency stop button. During the stop, the upper cablesnaps. The elevator engineer says that the cable could withstand a force of 40 Nwithout breaking. How long does it take for the elevator to stop?
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