Quizzes - CB Fall 2022 PH1100 PX + a/d2l/Ims/quizzing/user/attempt/quiz_start_frame_auto.d2l?ou=555904&isprv=&drc=0&qi=281863&cfql=0&dnb=0&fromQB=0 Time Left:1:56:39 Question 1 (1 point) Listen How much work is required to exert an horizontal force of 80.0 N on a 10.0 kg mass to move it an horizontal distance of 3.0 m? a) 800 Nm b) 240 J Derek Attwood: Attempt 1 Oc) 2400 J d) 120 J Question 2 (1 point)

Quizzes - CB Fall 2022 PH1100 PX + a/d2l/Ims/quizzing/user/attempt/quiz_start_frame_auto.d2l?ou=555904&isprv=&drc=0&qi=281863&cfql=0&dnb=0&fromQB=0 Time Left:1:56:39 Question 1 (1 point) Listen How much work is required to exert an horizontal force of 80.0 N on a 10.0 kg mass to move it an horizontal distance of 3.0 m? a) 800 Nm b) 240 J Derek Attwood: Attempt 1 Oc) 2400 J d) 120 J Question 2 (1 point)

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter11: Particle Physics And Cosmology

Section: Chapter Questions

Problem 86CP: The peak intensity of the CMBR occurs at a wavelength of 1.1 mm. (a) What is the energy in eV of a...

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The peak intensity of the CMBR occurs at a wavelength of 1.1 mm. (a) What is the energy in eV at a 1.1mm photon? (b) There are approximately 109 photons for each massive particle in deep space. Calculate the energy of 109 such photons. (c) If the average massive particle in space has a mass half that of a proton, what energy would be created by convening its mass to enemy? (d) Does this imply that space is “matter dominated”? Explain briefly.
(a) Calculate the approximate age of the universe from the average value of the Hubble constant, H0=20km/s . Mly. To do this, calculate the time it would take to travel 0.307 Mpc at a constant expansion rate of 20 km/s. (b) If somehow acceleration occurs, would the actual age of the universe be greater or less than that found here? Explain.
Which of Einstein's postulates of special relativity includes a concept that does not fit with the ideas of classical physics? Explain.
3- a) The distance to Alpha Centauri (the nearest large star to Earth) is 4.37 Ly (Light Years). What is the distance in miles (given that one Ly = 5.88 x 1012 miles?) b) Present rocket ship speeds are roughly 100,000 miles per hour, which is the same as 8.766 x 108 miles per year. At this speed, and using the distance you calculated in (a), how many years would it take to travel to Alpha Centauri?
1 - Resting pi mesons have a half-life of T. If a beam of pi mesons is traveling at a speed of v=βc, the distance at which the beam's intensity is halved is: ( ) cβT[(1+β)/(1-β)]^{1/2} ( ) βvT ( ) cβT[1 - β^{2}]^{-1/2} ( ) vT[1-β^{2}]^{1/2} ( ) cβT[1 - β^{2}]^{1/2}
Certain spiral galaxy is 9.9 Mpc away from us. How fast in km/s is this galaxy moving away from us? Note: Assume a value of the Hubble constant of 71.1 km/s/Mpc
The average lifetime of a pi meson in its own frame of reference (i.e., the proper lifetime) is 2.6 x10-8 s. If the meson moves with a speed of 0.93c, what is its mean lifetime (s) as measured by an observer on Earth? What is the average distance (m) it travels before decaying, as measured by an observer on Earth? What distance (m) would it travel if time dilation did not occur?
The parameter γ = 1/(1-v2/c2)1/2 can be used to determine how large relativistic effects can be expected to be. When the speed is small compared to the speed of light, γ does not get much larger than 1. As v gets close to the speed of light, γ gets very large.Randomized Variablesp = 0.045 At what speed, as a ratio to the speed of light, is γ = 1 + 0.045? This corresponds to a 0.045 × 100 percent relativistic effect. ?
The parameter γ = 1/(1-v2/c2)1/2 can be used to determine how large relativistic effects can be expected to be. When the speed is small compared to the speed of light, γ does not get much larger than 1. As v gets close to the speed of light, γ gets very large. Randomized Variablesp = 0.045 At what speed, as a ratio to the speed of light, is γ = 1 + 0.045? This corresponds to a 0.045 × 100 percent relativistic effect.
(a) What Hubble constant corresponds to an approximate age of the universe of 1010 y? To get an approximate value, assume the expansion rate is constant and calculate the speed at which two galaxies must move apart to be separated by 1 Mly (present average galactic separation) in a time of 1010 y. (b) Similarly, what Hubble constant corresponds to a universe approximately 21010years old?
Our solar system orbits the center of the Milky Way galaxy. Assuming a circular orbit 30,000 ly in radius and an orbital speed of 250 km/s, how many years does it take for one revolution? Note than this is approximate, assuming constant speed and circular orbit, but it is representative of the time for our system and local stars to make one revolution around the galaxy.
The peak intensity of the CMBR occurs at a wavelength of 1.1 mm. (a) What is the energy in eV of a 1.1-ram photon? (b) There are approximately 109 photons for each massive particle in deep space. Calculate the energy of 10^ such photons, (c) If the average massive particle in space has a mass half that of a proton, what energy would be created by converting its mass to energy? (d) Does this imply that space is "matter dominated”? Explain briefly.