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Physics
Physics
High School
What happens when thermal energy is applied to a substance q
Physics
High School
in most applications the braking torque of the friction brakes should be?
Physics
High School
the speed of sound in air is 332 m/s. humans have sensitivity to sound frequencies from 20 hz to 20,000 hz. a. what is the longest sound wavelength we can hear? (5 pts) b. what is the shortest sound wavelength we can hear? (5 pts)
Physics
High School
recall the two variables that affect the density of water, temperature and salinity. which scenario would cause the water to be most dense?
Physics
High School
duc 1. Define the term 'element. 2. If you break down each of the following, how many different atoms would you be able to recover? a) Mercury b) Sodium chloride c) Water d) Carbon dioxide e) Oxygen
Physics
High School
Show that the form of Newtons second law is invariant under the Galilean transformation. According to Newtons second law, the net force acting on an object is equal to the product of its mass and acceleration. Newtons second law of motion is given by following expression:
Physics
High School
A race track is constructed such that two arcs of radius 80 m at and 40 m at are joined by two stretches of straight track as in Figure 7.8. In a particular trial run, a driver travels at a constant speed of 50 m/s for one complete lap. The ratio of the tangential acceleration at to that at is (a) 1/2 (b) 1/4 (c) 2 (d) The tangential acceleration is zero at both points. The ratio of the centripetal acceleration at to that at is a) 1/2 (b) 1/4 (c) 2 (d) 4 (e) The centripetal acceleration is zero at both points. The angular speed is greatest at (a) (b) (c) It is equal at both and.
Physics
High School
where do stars form in the galaxy? group of answer choices in the halo in the bulge near the central engine in the spiral arms
Physics
High School
A system consists of two charges,and 109. The force exerted on charge q has a magnitudeof F. Does the force exerted on the charge 10 q have amagnitude that is greater than, less than or equal to F?Explain.
Physics
High School
a particle of mass 2.6 kg moves under the influence of the force f(x) = 3 x n. if its speed at x = 3.0 m is v = 7.0 m/s, what is its speed (in m/s) at x = 8.0 m?
Physics
High School
which of the following are likely to play a role in determining whether a galaxy is spiral or elliptical? select all that apply. select all that apply. the density of the protogalactic cloud from which the galaxy was born the rotation rate of the protogalactic cloud from which the galaxy was born the age of the universe at the time the galaxy first formed collisions or other interactions that the galaxy has had with other galaxies in the past
Physics
High School
at what speed, in m/s , would a moving clock lose 2.7 ns in 1.0 day according to experimenters on the ground? hint: use the binomial approximation.
Physics
High School
An astronaut of mass 75 kg is floating in space holding a 20 kg fire extinguisher. If she throws the extinguisher forward at a velocity of 3.5 m/s, what will be her resulting velocity?
Physics
High School
dheepthi started from point a in south direction. after walking for 4 m she turned to her right and walked 5 m. now she turned to her left and walked 3 m after which she turned to her right. now she walked 4 m and turned to her right again and walked 15 m. now finally she turned to her right and after walking for 7 m, she stopped at point b. what is the distance ab?
Physics
High School
a stone is dropped from the edge of a roof, and hits the ground with a velocity of -140 feet per second. how high (in feet) is the roof? note: the acceleration of an object due to earth's gravity is
Physics
High School
How do astronauts communicate with friends and loved ones while on a space station?A. Wi-Fi internetB. cell phonesC. ham radioD. satellite texting
Physics
High School
after the train passed, the pitch of the train whistle became lower. this change in sound would be represented by what change in the diagram below?
Physics
High School
A computer hard disk starts from rest, then speeds up withan angular acceleration of 190 rad/s until it reaches its finalangular speed of 7200 rpm. How many revolutions has the diskmade 10. 0s after it starts up?
Physics
High School
a barometer indicates that the atmospheric pressure is actually 768.2 mm hg. what is the pressure in kpa? a. 1.011 b. 102.4 c. 7.784 x 104 d. 7.582 e. 14.85
Physics
High School
the horizontal dashed line through the middle of the lens is called the optical axis. as the lamp is moved above or below the axis, keeping the horizontal distance to the center of the lens constant, how does the horizontal distance from the lens to the image change?
Physics
College
The graph above represents the nuclear decay of a radioactive element, measured using a radiation-detecting device. What is the half-life, in days, of this hypothetical element?
Physics
High School
(q017) what force causes the tidal bulge on the side of the earth opposite the moon (the secondary bulge)? group of answer choices the centrifugal force caused by the orbiting of the earth-moon system around its center of mass the sun's gravitational attraction the centripetal force caused by the orbiting of the earth-moon system around its center of mass the moon's gravitational attraction
Physics
High School
type 1 cable consists of ? twisted pairs, each individually shielded with foil, with a braided outer shield surrounding the entire cable core and covered with a jacket.
Physics
High School
Describe what happens as the hair dryer takes in cool air from one end and blows out warm air from other end TYYYY
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