Physics Work,Power & Energy Level: Misc Level
An object with a mass of 0.75 kg is dropped from rest from a height h=3.0 m above the top of a vertical spring that has spring constant k= 300 N/m.Draw a picture' a) Find the speed of the object when the spring is compressed 0.2 m. b) Find the compression of the spring when the object reaches its lowest point. c) After leaving the spring, how high above the top of the relaxed spring does the object rise before coming to rest.Explain the reasoning used for this question.
Physics Work,Power & Energy Level: Misc Level
A block of mass M is placed on a plane of length L which is inclined at an unknown angle with respect to the horizontal. There is friction between the block and the surfaces, so a gentle nudge is required to start the block moving. Assume this nudge is sufficiently gently so that the initial speed of the block is zero.When the block reaches the bottom of the incline, it slides along the table top until coming to rest a distance L from the bottom of the incline.a) What is the work done by the normal force that the plane exerts on the block? b)What is the work done by gravity during the entire motion? c)How is the work done by friction during the entire motion related to the work done by gravity? Explain all reasoning.
Physics Work,Power & Energy Level: Misc Level
An object slides without friction around a loop-the -loop. If the object is released from rest at a height h=3.5 R, a) what is its speed at the top of the loop? b) How large is the normal force on the object when it is at the top of the loop if its mass is 5 g?
Physics Circular Motion Level: Misc Level
A certain string breaks when it is subjected to 400 N of tension. A boy uses this string to whirl a 5.0-kg stone in a horizontal circle of radius 5.0 m. The boy continuously increases the speed of the stone.At approximately what speed will the string break?(Multiple Choice answer below, but of course, we have to show work)
(a) 10. m/s, (b) 20.m/s, (c) 80. m/s(d)100 m/s (1.0 x102 m/s), or (e)400 m/s (4.0 xlo2 m/s) What is the rotation rate (revolutions per minute (rpm)) of the stone just before the string breaks?
(f) 0.050 rpm, (g)0.64 rpm, (h) 1.6 rpm, (i) 38 rpm,or (j) 60 rpm
Physics Force & Laws Of Motion Level: Misc Level
A block of wood is sliding down a plane which is inclined 50.0 with respect to the ground. The coefficient of kinetic friction between the block of wood and the inclined plane is 0.125.Find the acceleration of the block.
Physics Force & Laws Of Motion Level: Misc Level
The ball in the figure (below) is supported by the two (masslessi) cables. You are told that the weight of the ball is 175 N. What are the tensions in cable 1 and cable 2? With the information given to you, do the tensions depend on whether or not this problem is being solved on Earth or Zarkon ?Assuming that this situation is on Zarkon, what is the mass of the ball?
Physics Kinematics Level: Misc Level
Prior to the diving competition on Zarkon, one of the intragalactic divers kicks a stray meteor off the 10.0- meter diving platform.i.e.The top of the platform is 10.0 meters avove the water.) Assuming she kicks the rock horizontally off the board at a speed of 7.00 m/s;
(a) How long does it take for the rock to hit the water (or whatever you swim in on Zarkon)?
(b) How far from the base of the diving platform does the rock hit the water?(take the base of the platform to be directly below the edge facing the water)
(c) What is the speed of the rock when it hits the water?
Physics Gravitation Level: Misc Level
At some point in the future, after the Earth Olympics, the Milky Way Olympics are held on the planet Zarkon. (Zarkon is inhabited by folks who like to think up physics questions.) This planet has a mass that is 0.100 that of the Earth,and a radius that is 0.500 that of the Earth.Zarkon also has a little moon Abba (that is rumored to be populated by retired Swedish rock stars).Abba has a mass which is 0.010 that of Zarkon, and a radius which is 0.20 that of Zarakon. What is the acceleration of gravity(gabba ) at the surface of Abba? Use gse zarkon =3.92 m/s2 to answer the next two question (if necessaryi).
Physics Kinematics Level: Misc Level
An Olympic shot putter is doing his thing; His shotput ball, with a mass of 6.00 kg, Iands 20.0 meters from where he launched it at a 45.0 degree angle.Assuming he accelerated the shot uniformly for 0.400 seconds, and neglecting the acceleration distance and any height difference between launch and landing (both not quite truei), with how much force did he'''put''the shot?
Physics Kinematics Level: Misc Level
In the metric drag races (a previously-unreported Olympic eventi),the hottest cars cross the finish line at speed of 100 m/s. Assuming these cars accelerate uniformly and continuously, what is the magnitude of their average acceleration if the drag track is 400 meters long?
Physics Kinematics Level: Misc Level
In the olympic trials, the winner of the first heat takes 42 seconds to run the 400 meter sprint. This race completes one lap around the track (assumed to be exactly 400 m in circumference) and the finish line is located at the same point on the track where the sprinters began their race. What was the average velocity of the race winner?
Physics Kinematics Level: Misc Level
Some students have gone to visit Valley of Fire State Park to study rock formations. They park their car and then begin walking to various interesting areas. First, they wal northeast (45%0 north of east) for 900.metters. Then, they walk 1.200 km in a direction 50.%0 north of west. Finally, they walk 0.700 km in a direction 30.%0 south of west and then set up camp for the night. It took two hours for the students to walk from their car to their camp.
A. How far is camp from the (distance and direction (with respect to north))?
B.What was the students' average speed between the car and camp?
C. What was the students' average velocity between the car and camp?
Physics Work,Power & Energy Level: Misc Level
(no pciture) A 0.024 kg bullet is fired straight up at a falling wooden block that has a mass of 3.0 kg.The bullet has a speed of 670 m/s when it strikes the block. The block originally was dropped from rest from the top of a building and had been falling for a time t when the collision with the bullet occured. As a result of the collision, the block (with the bullet in it) reverses direction, rises, and comes to a mo0mentary halt at the top of the building. Find the time t.s
Physics Center Of Mass Level: Misc Level
(no picture) Consider the two moving boxcars in Example 5.Car 1 has a mass of m1=65 103 kg and moves at a velocity of v01=+0.84 m/s.Car 2,with a mass of m2=92 103 kg and a velocity of v02=+1.4 m/s, overtakes car 1 and couples to it. Neglect the effects of friction in your answer. (a) Determine the velocity of their center of mass before the collision m/s (b) Determine the velocity of their center of mass after the collision m/s
(c) Should your answer in part (b)be less than, greater than, or equal to the common velocity vf of the two coupled cars after the collision? less than greater than equal to
Physics Force & Laws Of Motion Level: Misc Level
A stream of water strikes a stationary trbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of +18.0 m/s, while the exiting water stream has a velocity of -18.0 m/s.The mass of water per second that strikes the blade is 18.0 kg/s.Find the magnitude of the average force exerted on the water by the blade.
