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There are many evaluates of the number of stars in the universe. One evaluate is that there are 1010 stars in the Milky Way galaxy, and that there are 1010 galaxies in the universe. Assuming that the number of stars in the Milky Way is the average number of stars in a galaxy, evaluate how many stars there are in the universe. It perhaps goes without saying.
A 0.2kg steel ball is dropped straight down onto a hard horizontal floor and bounces straight up. Determine the magnitude of the impulse delivered to the floor by the steel vessel
One kilogram of water is heated from an initial temperature of 283K to a final temperature of 372K. Calculate the change in entropy. Assume the specific heat of water to be 4186 J/kgK. Hint: the amount of heat gained is a function of the temperature.
An object is attached to the lower end of a 100-coil spring that is hanging from the ceiling. The spring stretches with 0.160 m. The spring is then cut into two identical springs of 50 coils each. As the drawing shows, each spring is attached among t..
A toaster uses a heating wire. When the toaster is turned on at 20 degree C, the initial current is 1.54 A. A few seconds later, the toaster warms up and the current has a value of 1.23 A. The average temperature coefficient of resistivity for thi..
A child's toy consists of a m = 26 g monkey suspended from a spring of negligible mass and spring constant k. calculate the speed of the monkey in Ve m/s as it passes through equilibrium
A factory worker pushes a 28.6 kg crate a distance of 4.9 m along a level floor at constant velocity by pushing downward at an angle of 32 degrees below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.26. How m..
a point charge q10-9 coulombs is placed at the centre of a dielectric sphere of radius r10cm. the relative permittivity
A swallow can fly at 13 m/s through the still air. When the wind blows 5 m/s to the east the swallow flies straight north to nest is 480 m away. How long does it take to reach the nest?
The membrane that surrounds a certain type of living cell has a surface area of 5.00 10-9 m2 and a thickness of 1 10-8 m. how much charge resides on the outer surface
A 34.7 m long aluminum wire at a temperature of 24.3 oC has a radius of 0.295 mm. determine the current in the wire
A long, thin rod (length = 4 m) lies along the x axis, withits midpoint at the origin. In a vacuum, a +8 microC pointcharge is fixed to one end of the rod, find the magnitude of the net torque applied to the rod
a 2021-kg car is moving down a road with a slope grade of 13 while slowing down at a rate of 3.4 ms2. what is the
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