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A steel cable is stretched across a gorge. The cable is 190 m long and has a mass of 44 kg. When one end of the cable is struck with a hammer, a wave pulse travels down the cable, reflects at the far end, and is detected back at the first end 14 s later. What is the speed of the wave?
If you lift the front wheel of a poorly maintained bicycle off the ground and then start it spinning at 0.72 , what is the magnitude of the frictional torque
A cylindrical glass of water (H2O) has a radius of 4.38 cm and a height of 12.3 cm. The density of water is 1.00 g/cm3. How many moles of water molecules are contained in the glass
Assume the mass density of Earth from the center to r= R_cm (radius of the core mantle boundary) is d_cm and from R_cm until the surface r=R_e the density is d_e. Using these densities, determine the gravitational potential energy of the Earth
A race car has a mass of 702kg. It starts from rest and travels 42 m in 3 s. The car is uniformly accelerated during the entire time. What net force is exerted on it.
A cylinder with a ,ovable piston contains gas at a temp of 27degree C, a whole volume of 1.50 m cubed and an absolute pressureof 0.200 X 10 ^ 5 pa. What will be its final temp if the gas is compressed to 0.700 m cubed and the absoulte pressure increa..
A dog running in an open field has components of velocity vx = 2.4m/s and vy = -2.5m/s at time t1 = 11.3s . For the time interval from t1 = 11.3s to t2 = 18.0s , What is the magnitude of the dog's velocity
How many atoms are there in a cubic centimeter of a solid and what is the velocity of the motorist relative to the police car and what is the velocity of the police car relative to the motorist?
Neglect friction, what steady force, applied at its outer edge and perpendicular to plane of the door, can move it from rest through an angle of 90° in 30 s.
A proton accelerates from rest in a uniform electricfield of 670 N/C. At some later instant,its speed is 1.60 X106 m/s(nonrelativistic, because v is much less than the speed oflight). Find the acceleration of the proton.
A solid metal ball of radius 1.6 cm is located near a hollow plastic ball of radius 2.1 cm, What is the electric field at the center of the metal ball due just to the charges on its surface
Using the Equation of Hydrostatic Equilibrium, show that if we measure the pressure at the base of the atmosphere, Use the answer in the previous part to write an expression for the total mass of Earth's atmosphere
A spaceship is measured to be 120 m long while it is at rest with respect to an observer. If the spaceship now flies past the observer with a speed of .99c, what length would the observer measure of the spaceship.
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