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A block of mass 6 kg, which has an initial speed of 3 m/s at time t = 0, slides on a horizontal surface. Find the magnitude of the work that must be done on the block to bring it to rest. Answer in units of J. Also if a constant friction force of magnitude 12 N is exerted on the block by the surface, find the magnitude of the acceleration of the block. Answer in units of m/s^2.
The gravitational acceleration of bodies dropped near the Moon's surface is about 1.6 m/s^2. Find the time for an object dropped from rest to fall 3.0m on the Moon Find the time for an object dropped from rest to fall 3.0m on Earth.
The density of water in Earth's hydrosphere and the density of rocks in the crust are both lower than the average density of the planet as a whole
Assume a dampening depth, d, of 30 cm and a period, lambda, of 24 hours (8.64 x 104 sec). Assume a volumetric heat capacity, C, of 0.5 cal/cm °C, find the thermal diffusivity and conductivity
A couple of astronauts agree to rendezvous in space after hours. Their plan is to let gravity bring them together. Find the his and her initial acceleration
A 40.0 cm diameter cylinder of helium gas is 70.0 cm long and at 30.0 ^circC. The pressure gauge reads 140 psi. How many helium atoms are in the cylinder.
A space traveler weighs 580 N on earth. What will the traveler weigh on another planet whose radius is three times that of earth and whose mass is twice that of earth?
What is the magnitude of the magnetic forces on each of three sides?
A child sits on the edge of a spinning merry-go-round that has a radius of 2.9 m. What is the child's acceleration
A car is driving directly north on the freeway at a speed of 117 km/h and a truck is leaving the freeway driving 76 km/h in a direction that is 40° west of north. What is the velocity of the truck relative to the car?
A 1.0-cm-diameter pipe widens to 2.0 cm, then narrows to 0.5 cm. What is the speed through the second segment
A wooden dowel (cylinder) has a diameter of 2.20 cm. Determine the density of the dowel
imagine a hole is drilled down to the center of the earth. a small mass m is dropped into the hole. find the speed of the mass just as it reaches the earth's center
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