Physics Force & Laws Of Motion Level: Misc Level
Two objects are connected by a light string that passes over a frictionless pulley, as in Figure P5.26. Draw free-body dia-grams of both objects.If the incline is frictionless and if mI=2.00 kg m2=6.00 kg, and 0=55.0%, find (a) the ac- celerations of the objects, (b) the tension in the string, and (c) the speed of each object 2.00 s after being released from rest.
Physics Force & Laws Of Motion Level: Misc Level
Two blocks of mass 3.50 kg and 8.00kg are connected by a massless string that passes over a frictionless pulley (Fig.P5.68). The inclines are frictionless. Find (a) the magni-tude of the acceleration of each block and (b) the tension in the string.
Physics Rotational Mechanics Level: Misc Level
A 4.00 kg object is attached to a vertical rod by two strings. as in Figure P6.11. The object rotates in a horizontal circle at constant speed 6.00 m/s.Find the tension in (a) the up-per string and (b) the lower string.
Physics Force & Laws Of Motion Level: Misc Level
If the coefficient of static friction between your coffee cup and the horizontal dashboard of your car is u s=0.800, how fast can you drive on a horizontal roadway around a right turn of radius 30.0m before the cup starts to slide?If you go too fast, in what direction will the cup slide relative to the dashboard?
Physics Circular Motion Level: Misc Level
A space station,in the form of a wheel 120 m in diameter, rotates to provide an artificial gravity"of 3.00 m/s2 for persons who walk around on the inner wall of the outer rim.Find the rate of rotation of the wheel (in revolutions per minute)that will produce this effect.
Physics Vectors Level: Misc Level
3.55 The velocity of the wind relative to the water is crucial to sailboats. Suppose a sailboat is in an ocean current that has a velocity of 2.20 m/s in a direction 30 degrees east of north realtive to the earth.It encounters a wind that has a velocity of 4.50 m/s in a direction of 50 degrees south of west relative to the earth. What is the velocity of the wind relative to the water?
Physics Vectors Level: Misc Level
A jet airplane has an air speed of 260 m/s in a direction 5 degrees south of west. If is in the jet stream, which is blowing at 45.0 m/s in a direction 20 degrees south of east. What is the velocity of the airplane relative to the earth?
Physics Kinematics Level: Misc Level
3.48 A seagull flies at a velocity of 9.00 m/s2 straight into the wind.a) if it takes the bird 20.0 min to travel 6.00 km relative to earth, what is the velocity of the wind?
Physics Kinematics Level: Misc Level
A ranger in a national park is driving at 27.4 mi/hr when a deer jumps into the road of the vehicle. After a reaction time of t the ranger applies the brakes to produce an acceleration of -8.96 ft/s^2. What is the maximum reaction time allowed if she is to avoid hitting the deer? Answer in units of s
Physics Waves And Oscillations Level: Misc Level
A sound wave, traveling at 320 m/s, is emitted by the foghorn of a tugboat .An echo is heard 3.29 s later. How far is the reflecting object?Answer in units of m.
Physics Units Level: Misc Level
What is the required dimension for the quantity C5 in the expression =S/C5?
Physics Units Level: Misc Level
What is the required dimension for the quantity C4 in the expression s=C3 cos (C4t) ?
Physics Units Level: Misc Level
What is the required dimension for the quantityC3 In the expression S= C3 cos (C4 t)?
Physics Force & Laws Of Motion Level: Misc Level
Consider a lawnmower of weight w which can slide across a horizontal surface with a coefficient of friction (u) . In this problem the lawnmower is pushed using a massless handle , which makes an angle (theat) with the horizontal .Assume that Fh ,the force exerted by the handle, is parallel to the handle.
Physics Kinematics Level: Misc Level
A brick is thrown horizontally from the top of a building with an initial speed of 15 m/s. It strikes the ground after 3 seconds.How high is the building?