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Suppose that the Hubble constant had a value of H = 135 km/s/Mpc. What would be the age of the universe? Billion years
What if H had a value of 45 km/s/Mpc? Billion years
Using energy considerations, compute the average force the beam exerts on the pile driver while the pile driver is brought to rest.
Consider a book of mass 10 kg on a frictionless incline that makes an angle of 40? with the horizontal. Find the acceleration of the book down the incline
A spotlight on a boat is y = 2.7 m above the water, and the light strikes the water at a point that is x = 9.4 m horizontally displaced from the spotlight (see the drawing). The depth of the water is 4.0 m. Determine the distance d, which locates the..
The objects are then released from rest. Assuming that the particles never reach the pulley, and also that the particles do not rebound when they strike the ground.
At 28.5°C, an aluminum ring has aninner diameter of 9.0000 cm and abrass rod has a diameter of 9.0500cm. If only the ring is heated, what temperature must itreach so that it will just slip over the rod?
Four ropes are tied to a stake, and each is pulled toward a compass direction, N, S, E, or W. A force of 7 N is applied to the rope pulled toward the east. Forces of 18, 26, and 45 N are applied toward the south, west, and north, respectively.
A rigid rod of mass m3 is povited at point A, and masses m1 and m2 are hanging from it, as shown. Point A L1 m3 L2 m1 m2 (a) What is the normal force acting on the pivot point? (b) What is the ratio of L1 to L2, where these are the distances from the..
A strut having a mass of 40kg/m is supported by a cable, as shown. The structure supports a block having a mass of 500kg. Find the force in the cable and the horizontal and vertical reactions at the pin-connection at B. Neglect the mass of the ca..
A rock of mass m = 1.1 kg is tied to a string of length L = 2.5 m and is twirled in a vertical circle, what is the tension when the rock is at the bottom
A light ray enters a glass slab at point A at an angle of 57.6° with respect to the surface normal and then undergoes total internal reflection at point B. What minimum value for the index of refraction of the glass can be inferred from this?
The spring constant of a toy dart gun is 5000 N/ M. To cock the gun the spring is compressed 3 cm. Estimate the speed of the projectile when it returns to its starting point
A projectile is fired from the ground with a speed of 32 m/s, 68° above the horizontal. What is the projectile's maximum height
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