quiz_lec37

Computation. Consider a frictionless flywheel in the shape of a uniform solid disk of radius 1.8 m. Calculate its mass if it takes 7.3 kJ of work to spin up the flywheel from rest to 548 rpm. [Tip: Be careful with units.] M = kg O Search Record your numerical answer below, assuming three significant figures. Remember to include a "-" as necessary. Ca 4 @

1. I am driving my 3500 pound weight car at 45 mph around a flat curve of radius 50 meters. If the us = 0.85, do I make it around the curve? (Y/N). It starts raining and the us drops to .65. Do I make it now? (Y/N). At that speed what is the kinetic energy of my car? Joules 2. Tom is doing a bucket lab with a mass of 5 kg of water. If he swings it 8 times around in 8 seconds and his arm is 0.8 meters long, what centripetal force is the bucket putting on his shoulder? Does the water fall on him? Newtons. _(Y/N). If he were on Mars (m-6.42*10^23 Kg, R=3397000 meters) would he get wet? 3. You are working on a pumped storage facility design. You have a pond on top of a hill. You approximate the pond as a cylinder with a diameter of 1500 feet and an average depth of 20 feet. The center of the pond is 300 feet above a river where you will let the pond full of water flow thru a turbine making electricity. What is the GPE of the pond? joules

A wrench is used to tighten a nut. A 100-N force is applied 0.10 m from the axis of rotation. what is the work done to turn the nut through 1.5 radians ?

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A hollow spherical ball is let go from the top of a track and goes around a circular loop (R = 60 cm ). 23. What must be the minimum height of the track so that the ball will not fall off the track at the topmost point of the loop? No 24. When the above condition is met, what is the tangential speed of the ball when it reaches the topmost point? R

A block of m = 12 kg is placed against the vertical front of a cart as shown below. What acceleration must the cart have so that block A does not fall? The coefficient of static friction between the block and the are is m, = 0.4. a. 24.5 m/s2 O b. none of these О с. 36.8 m/s? O d. 6.1 m/s? О е. 18.4 m/s?

Answer the following question You are given four objects. A Solid cylinder, a thin-walled hollow cylinder, a solid sphere, and a hollow sphere. All of them have the same mass ?m, and radius ?R. They are all put on an incline plane of hight ℎh, and angle ?θ. 1a) Derive a formula for the final speed at the bottom of the ramp in terms of ?,?,ℎ,?m,R,h,I, and ?θ. 1b) Which one will get to the bottom first? (Hint: ?I is for Rotational Inertia).

The following figure shows the cross section of a cylinder of radius 7.5 m rotating about its axis at :9.0 rad/s. The speed of the point P is rad/s 212.06.a O Can not be determined .b O m/s 212.06.c O m/s 67.50.d O rad/s 67.50.e O

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A flywheel whose moment of inertia / = 200 lb-ft² is spinning at 180 RPM. For a flywheel, KE = Iw²/2, where w is the angular velocity, rad/s. Let g = 32.2 ft/s². Step 1 How high above the surface of the earth, in ft, would a 90 lb mass have to be raised to have its potential energy equal to the kinetic energy of the flywheel? h = i ft

what is the answer?

25. Please give step by step answer. Thanks.

4. Consider the motorcyclist driving along a vertical circular track. Assume that the wheels of the motorcycle roll without slipping. Draw a free body diagram of the motorcyclist at the circled position. Draw a square around the force components that contribute to the centripetal acceleration. Draw a circle around the force components that contribute to the tangential acceleration. a. b. For each force component in your free body diagram in part (a), determine whether the work done by the force component is positive, negative, or zero.

An electric motor turns at 1200 RPM while delivering a torque of 20 in-lb. a. What is the angular velocity (rad/s)? b. What is the power (inch pounds per second)? c. What is the power (foot pounds per second)? d. What is the power (horsepower)? e. What is the power (watts)? Hint: 1 hp = 745.7W

A 6kg hoop 3m in diameter rolls down a plane inclined 40 degrees. At the bottom of the incline, what is it's a.) total kinetic energy b.) angular speed and c.) linear speed. Ignore friction. I (hoop) = MR^2 ... 3 m

Please answer part A and Part B

Force F = -4.8 Ni+ 2.8 N j acts on a small rock with a position vector r = 6.8 m i+ 2.2 mj relative to the origin. In unit vector notation, what is the resulting torque on the rock about the point (2.1,3.1,7.8)m? a. 29.6 (-k) Nm b. 8.5 j Nm c. 29.6 k Nm d. -26.5 j Nm

A 330 N sphere 0.20 m in radius rolls, without slipping 6.0 m down a ramp that is inclined at 37 degrees with the horizontal. What is the angular speed of the sphere at the bottom of the hill if it starts from rest? Rad/s

na sayfası Takvim Nişanlar Tüm dersler Course dashboard A horizontal 800-N merry-go-round is a solid disk of radius 1.50 m and is started from rest by a constant horizontal force of 50.0 N applied tangentially to the edge of the disk. Find the kinetic energy of the disk after 3.00 s? А. 200 J В. 320 J С. 276 J D. 210 J E. 400 J Lütfen birini seçin: O A O B

4. 4. Which rolls down an inclined plane faster, a hoop or a solid cylinder? Both have the same mass and radius. Explain your answer  a. neither, they roll down equally fast   b. the hoop    c. the solid cylinder

During a very quick stop, a car deceleraes at 7.00 m/s^2.a. What is the angular acceleration of its 0.280-m-radius tires, assuming they do not slip on the pavement?b. How many revolutions do the tires make before coming to rest, given their initial angular velocity is 95.0 rad/s?c. How long does the car take to stop completely?d. What distance does the car travel in this time?e. What was the car’s initial velocity?f. Do the values obtained seem reasonable, considering that this stop happens very quickly?

6. Consider the two vectors. 4-3-4j B = 6k a. What is the cross product AXB? b. What is the dot product A. B?

Force F = -4.4 Ni+6.4 N j acts on a small rock with a position vector r = 3.1 m i+ 8.5 m j relative to the origin. In unit vector notation, what is the resulting torque on the rock about the point (2.4,4.7,9.9)m? a. -17.6 j Nm O b. 40.8 j Nm O c. 57.2 (-k) Nm d. 57.2 k Nm

What is the speed of a point on the rim?

A car goes around a curve with a radius of 120 m. The car goes through an angle of 60 degrees at a constant speed of 20 m/s.a. Calculate the distance the car travels as it goes around the curve.b. Calculate the car's angular velocity.b. Calculate the car's velocity.

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Calculate the torque about the z-axis that is out of the page at the origin in the following figure, given that F,=3N, F2=2N, F3=3N, F4=1.8N. YA ... 30° 2 m 3 m 2 m F3 20 Round your answer to 2 decimal places. Add your answer

A solid spherical jewel rolls smoothly from rest down a ramp. The jewel descends a vertical height of 1.2m to reach the bottom of the ramp. What is the jewel's speed at the bottom of the ramp? Hint: This problem has nothing to do with elasticity as we did not formally cover that topic, and the inertia of a solid sphere is found by 2/5 m r2

1. What is the minimum radius Rhump you can use for the semi-circular hump? 2. What is the minimum radius Rloop you can use for the vertical loop?

Solve for the angular speed of a car while taking a circular turn of radius 100 m at 36km/hour. a. 1000 rad/s b. 0.1 rad/s c. 100 rad/s d. 1 rad/s