An 80 kg astronaut has gone outside his space capsule to do some repair work. Unfortunately, he forgot to lock his safety tether in place , and he has drifted 5.0 m away from the capsule . Fortunately, he has a 1000 W portable laser with fresh batteries that will operate it for 1.0 h. His only chance is to accelerate him self toward the space capsule by firing the laser in the opposite direction. He has a 10-h supply of oxygen. How long will it take him to reach safety

An 80 kg astronaut has gone outside his space capsule to do some repair work. Unfortunately, he forgot to lock his safety tether in place , and he has drifted 5.0 m away from the capsule . Fortunately, he has a 1000 W portable laser with fresh batteries that will operate it for 1.0 h. His only chance is to accelerate him self toward the space capsule by firing the laser in the opposite direction. He has a 10-h supply of oxygen. How long will it take him to reach safety

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter7: Electric Potential

Section: Chapter Questions

Problem 32P: (a) What is the average power output of a heart defibrillator that dissipates 400 J of energy in...

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On December 27, 2004, astronomers observed the brightest flash of light ever recorded from outside of our solar system. It came from a highly magnetic neutron star SGR 1806-20 (also know as a magnetar). During the 0.20 s burst, this star released as much energy as our sun would over a period of 250,000 years. If our sun outputs approximately Psun = 3.846x 1026 W, what was the average power output of this magnetar in terms of Psun?
Suppose a battery operates a 2.25 W electric clock for 19.5 months. 1. What is the available energy content, in joules, of the battery? 2. How many years can a battery that supplies 7.75 × 104 J run a pocket calculator that consumes energy at the rate of 1.05 × 10-3 W?
Let's try a few more examples that relate power and energy. A certain high-efficiency LED light bulb has a power output of 9.20 W. That is, 9.20 J of electric energy is converted to electromagnetic (light) energy and radiated away every second. How much energy is output by the lightbulb if it is left on for a total time of 7.50 hours? In this case, we're relating power to energy change, so we simply use the relationship E t P = Here, instead of work W, we use in the equation E, which is the amount of energy output or converted in the amount of time t. From this, what do we find the total energy output in joules to be? 33120 X x Solve the above equation for the energy E in terms of power P and time t. Remember that 1 W = 1 J/s, so to find the energy in joules, convert the time to seconds first. There are 60 minutes in one hour and 60 seconds in one minute. J
The image attached is a neat copy of a photo of an electricity meter for a domestic solar array. The display shows the energy we sold to the electricity company on a winter's day. Each box is 100 W high and 1 hr wide. At the radius of the earth's orbit, the intensity of sunlight is I=1.4 kW.m–2 . (This means that 1.4 kW.m–2 passes through 1 square metre at right angles to the sun's rays.) The solar array in the previous question consists of 10 panels, each with area A=1.6 m2 . Under optimal conditions - with the sun at right angles to the array and no clouds in the sky - the array produces Pout=2.3 kW . What is the efficiency of the array? Power out/power in = _____ %.
An electron travels with = 5.50 x 106 m/s through a point in space where E = (2.30 x 105 -2.30 x 1053) V/m and B = -0.100 k T.
The Cassini spacecraft that visited Saturn and its moons did more than take pretty pictures; it also returned physical data. Saturn’s moon Titan has a substantial atmosphere, and Cassini went close enough to detect atoms and molecules from Titan’s atmosphere. It measured the atmospheric composition with a time-of-flight mass spectrometer. Ionized atoms and molecules were accelerated through a 30 kV potential difference and then sent through a chamber of length 18.8 cm. The time to travel the length of the chamber was measured, with heavier particles taking longer times. What is the travel time for a singly ionized molecule of water?
A cyclotron is used to produce a beam of high-energy deuterons that then collide with a target to produce radioactive isotopes for a medical procedure. Deuterons are nuclei of deuterium, an isotope of hydrogen, consisting of one neutron and one proton, with total mass 3.34 x 10-27 kg. The deuterons exit the cyclotron with a kinetic energy of 5.00 MeV.a. What is the speed of the deuterons when they exit?b. If the magnetic field inside the cyclotron is 1.25 T, what is the diameter of the deuterons’ largest orbit, just before they exit?c. If the beam current is 400 μA, how many deuterons strike the target each second?
A 10 grams bullet moving at a speed of 150 ft/s passes through a plank of wood. After passing through the plank, its speed is 130 ft/s. Another bullet with mass 12 grams, of the same size but moving at 90 ft/s, passes through an identical plank. What will this second bullet’s speed be after passing through the plank? Assume that the resistance offered by the plank is independent of the speed of the bullet. a. 58.59 ft/s2 c. 68.59 ft/s2 b. 48.59 ft/s2 d. 78.59ft/s2
you are standing 2.5 m from a 150-W lightbulb. If the pupil of your eye is a circle 5.0 mm diameter, how much energy enters your eye per second? (assume 5.0% of the lightbulb's power is converted to light)
Solar cells generate a potential difference when exposed to sunlight. In an experiment, you wish to charge a rechargeable battery by connecting it in series to an array of solar cells. You perform the experiment outdoors, in direct sunlight, when the intensity of solar radiation is 1000 W/m2. However, your solar cells only have an efficiency of 11% (that is, only 11% of the sunlight power transmitted to the solar cells is delivered to the rechargeable battery). While the circuit is connected, you measure at one instant the potential difference across the battery to be 4.90 V and the current in the circuit to be 0.25 A. What is the area of the array of solar cells? _____________ m2
A 9 W led lightbulb emits the same light as a 60 W standard lightbulb. If a power company charges 10 cents per kW.h, then how much money do you save by using the led lightbulb instead of the standard lightbulb for 30 days?
High-speed flash photography was pioneered by Doc Edgerton in the 1930s, while he was a professor of electrical engineering at MIT. You might have seen examples of his work in the amazing shots of hummingbirds in motion, a drop of milk splattering on a table, or a bullet penetrating an apple . To stop the motion and capture these pictures, one needs a high-intensity, very short pulsed flash, as mentioned earlier in this module. Suppose one wished to capture the picture of a bullet (moving at 5.0×102 m/s ) that was passing through an apple. The duration of the flash is related to the RC time constant, τ . What size capacitor would one need in the RC circuit to succeed, if the resistance of the flash tube was 10.0 Ω ? Assume the apple is a sphere with a diameter of 8.0×10–2 m.