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A Cepheid variable in a nearby galaxy looks 106 times fainter than an identical Cepheid in the Milky Way. The Cepheid in the Milky Way in 1000 parsecs away. How far away is the nearby galaxy.
If the car was in neutral and its brakes were off, so that the collision is approximately elastic, find out the final speed of the truck.
Your forehead can withstand a force of about 6.0kN before fracturing while your cheekbone can only withstand about 1.3 kN. what is the magnitude of the balls deceleration
Suppose a car is traveling at +16.8 m/s, and the driver sees a traffic light turn red. After 0.569 s has elapsed, calculate the stopping distance of the car
During each cycle, a refrigerator ejects 605 kJ of energy to a high-temperature reservoir, Determine the work done on the refrigerant in each cycle
you rub your hand across a small surface section of a pillow. The section of pillow acquires a net charge of -9.4 muC, Determine the net charge on your hand
A dog running in an open field has components of velocity = 3.4 and = -1.9 at time = 10.4. For the time interval from = 10.9 to = 24.7, the average acceleration of the dog has magnitude 0.45 and direction 25.
A sound pulse has a power of 893.1 watts. It is radiating outwards from a point and at the time of observation is a radius of 7861.6 m from that point
The speakers produce the same single-frequency tone in either drawing and are in phase. The speed of sound is 343 m/s. Find the single smallest frequency that would produce both constructive interference in drawing 1 and destructive interference in d..
An 9.0 kg object is moving 5m/s in the positive x direction has a one dimensional collisions with a 3.0 kg object moving 4.0 m/s in the opposite direction. What is the total kintetic energy of the two-mass system
A hydrogen atom is initially at n =3 state. How much energy is required to ionize this atom
A mortar crew is positioned near the top of a steep hill. Enemy forces are charging up the hill and it is necessary for the crew to spring into action.
drop a rock into a well. You hear the splash 2.40 s after you release the rock from rest. How far below the top of the well is the surface of the water
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