College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- A Fall on the Moon. You and your team are stationed at an earth-based mission control facility and have been tasked with assisting astronauts via radio communication as they exit a spacecraft that has recently landed on the moon. The astronauts intended to explore the lunar surface but, unfortunately, they hit a snag even before they opened the hatch. Their craft has landed right on the edge of a 15-ft cliff, so that there is no way off the lander except to drop that distance from the bottom rung of a ladder on the side of the ship. You look up the structural parameters of the space suits, the gear they are wearing, and the physical limitations of the crew, and find that, on earth, the maximum drop they can safely endure is 4.0 ft. (a) Is it safe for them to make the 15-ft drop on the moon? (b) What is the maximum drop they can safely endure on the moon? Note that the acceleration due to gravity on the moon is one-sixth as large as that on earth.arrow_forwardCan you solve this question with all the steps it took to get there with an explanation about the steps.arrow_forwarda) how much net work is required to accelerate a 1135-kg car from 18 m/s to 40 m/s? b) how much net work is required to accelerate a 955-kg car from 17 m/s to 45 m/s? c) how much net work is required to accelerate a 1089-kg car from 16 m/s to 36 m/s?arrow_forward
- In considering the energy supply for an automobile, the energy per unit mass of the energy source is an important parameter. The "heat of combustion" or stored energy per mass is quite similar for gasoline, ethanol, diesel fuel, cooking oil, methane, and propane. For a broader perspective, compare the energy per mass in joules per kilogram for gasoline, lead-acid batteries, hydrogen, and hay by stating the factor of increase between each one and the next. Hydrogen has "heat of combustion" 142 MJ/kg. For wood, hay, and dry vegetable matter in general, this parameter is 17 MJ/kg. A fully charged 17.0 kg lead-acid battery can deliver power 1450 W for 1.0 hr. (For comparison, the "heat of combustion" of gasoline is about 44 MJ/kg.) battery MJ/kg hay ✕ larger than battery energy/mass gasoline ✕ larger than hay energy/mass hydrogen ✕ larger than gasoline energy/massarrow_forward(4) The scalar product is also useful for applications other than finding the work done by a force. The scalar product makes some problems that would otherwise be difficult relatively easy. Example: Suppose that the data from X-ray diffraction of a crystal indicates that the positions of the atoms in a molecule are as follows: The position of the carbon atom is C = 0i + 0f + 0k, the position of a neighboring oxygen atom is ö = 2î + 2j + k, and a hydrogen atom is located at H = -î + 2î – k. The oxygen atom and the hydrogen atoms are both bonded to the carbon atom. Distances are in nanometers (nm). a. What is the length ||Ō|| of the C-O bond? b. What is the length ||H|| of the C-H bond? c. What is the angle 0 between the C-0 and C-H bonds? You can solve this problem by taking the two ways to find the scalar product and setting them equal to each other, i.e., use the fact that 0 H = OH cos 0 = 0,Hx + 0,Hy+ 0,Hz.arrow_forward(a) Compute the electrical energy used by a household whose monthly electrical bill is $40, computed at the rate of $0.05 per kWh. (b) How long could this energy be used to burn ten 100 W light bulbs? (c) If this energy were used to raise a car of mass 2100 kg, to what height would the car be raised?arrow_forward
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