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Our galaxies are speeding apart from each other and that is because of dark energy, but we don't know where it comes from right? If I'm not mistaken could dark matter have dark energy? (If they are the same thing please correct me.) Matter has gravity so could dark matter have dark energy, so sense there is more dark matter is that why our galaxies are being pushed apart?
A 12kg hammer strikes a nail at a velocity of 8.2m/s and comes to rest in a time interval of 8.0. What is the average force acting on the nail
Using a force of 28.0 Newtons, a student pulls a 70.0 Newton weight along the table top for a distance of 15.0 meters in 3.0 seconds. Compute the power developed by the student.
0.800 x 1010 photons pass through an experimental apparatus. How many of them land in a 0.140-mm-wide strip where the probability density is 15.0 m-1
A machine does work at a rate given by Pct^2 , where c = 15W/s^2 and t is time. Find the work done by the machine between 15s and 20s? huh
What is the rms speed of nitrogen molecules at a temperature of 55 oC? The mass of a nitrogen molecule is 4.680×10-26 kg
While skiing in Jackson, Wyoming, your friend Ben (of mass 84.3 kg) started his descent down the bunny run, 27.7 m above the bottom of the run. If he started at rest and converted all of his gravitational potential energy into kinetic energy, what is..
A flashlight bulb carries a current of 0.19A for 76s. How many electrons
How far will the ball travel if the bat is 1 m in length if the instaneous linear velocity of the bat is 37.5 m/s at the moment of impact
In an attempt to reduce the extraordinarily long travel times for voyaging to distant stars, some people have suggested traveling at close to the speed of light. How fast must the rocket travel relative to earth
An ambulance traveling at 47 m/s approaches a car heading in the same direction at a speed of 37 m/s. At what frequency does the driver of the car hear the siren
an automobile is moving at 90 kmh and ascends a hill of gradient 1 in 25 vertical rise of 1 unit for horizontal
A meter stick lies along the optical axis of a convex mirror of focal length -39 cm, with its nearest end 56 cm from the mirror. How long is the image of the meter stick?
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