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A person whose eyes are 1.7m above the floor stands in front of a plane mirror. The top of her head is 0.12m above her eyes. What is the height of the shortest mirror in which she can see her entire
An engine falls off an airplane at a speed of 280m/s and an altitude of 4500m. What is the horizontal distance the engine will travel before it hits the ground?
A solid ball with a mass of 4.67 kg and a radius of 0.027 m starts from rest at a height of 1.40 m and rolls down a 84.7? slope. What is the translational speed of the ball when it leaves the incline?
A loudspeaker of mass 25.0 kg is suspended a distance of h = 1.00 m below the ceiling by two cables that makeequal angles with the ceiling. Each cable has a length of l = 2.90 m. What is the tensio
The length of a string is 532 cm. It is held fixed at each end. The string vibrates in seven sections; i.e., the string has seven antinodes, and the string vibrates at 150 Hz. What is the wavelength
The period of oscillation for a mass-on-a-spring system is 0.32 s. If m = 2.9 kg, what is the spring constant of the spring?
A speed of 5.80 m/s in still water is rowed across the river at an angle of 53.0 degrees to the river flow. Calculate the resultant velocity with which the boat moves and the angle that it its resu
When the temperature of a metal cylinder is raised from 0.0°C to 77°C, its length increases by 0.19%. Find the percent change in density.
A 130-{rm kg} crate, starting from rest, is pulled across a floor with a constant horizontal force of 410 N. For the first 13 m the floor is frictionless, and for the next 13 m the coefficient of fr
When the temperature of a metal cylinder is raised from 0.0°C to 100°C, its length increases by 0.14%. Find the percent change in density.
A girl rides an escalator that moves her upward at a constant speed. As the girl rises, how do her gravitational energy and kinetic energy change?
A football coach sits on a sled while to of his players build their strength by dragging the sled across the field with ropes. The friction force in the sled is 1000N and the angle between the two r
Two packing crates of masses 10.0 kg and 5.00 kg are connected by a light string that passes over a frictionless pulley. The 10kg crate hangs vertically and the 5.00-kg crate lies on a smooth inclin
A uniform steel beam has a mass of 940 kg. On it is resting half of an identical beam, What is the vertical support force at each end? left end and right end
A student of weight 655 N rides a steadily rotating Ferris wheel (the student sits upright). At the highest point, the magnitude of the normal force N on the student from the seat is 564 N. (a) What
A straight wire of length L and carrying a current I stays suspended horizontally in mid air in a region where there is uniform magnetic field B. The linear mass density of the wire is lambda. Obta
You pull a 12 kg sled across the floor with a strap that is at an angle of 31° above the horizontal with a force 76 N. Find the magnitude of the acceleration of the sled, given that the coeffici
A 2.1 x 10^3 kg car starts from rest at the top of a driveway tat is sloped at an angle of 20 degrees with the horizontal. An average friction force of 4.0 x 10^3 N impedes the cars motion so that
A space traveler weighs 550 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?
A Cessna aircraft has a lift-off speed of 130 km/h. What minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 200 m?
Now find the magnitude of the force on an electron placed at point P. Recall that the charge on an electron has magnitude e = 1.60 times 10^{-19} ; {rm C}.
The cylinders are rigidly connected to each other but are free to rotate without friction on a common axle. The moment of inertia of the pair of cylinders is I = 45 kgm2 Also r1 = 0.5 meter, r2 = 1.
An ac generator has a frequency of 2.4 kHz and a voltage of 240 V. An inductance L1 =6.0 mH is connected across its terminals. Then a second inductance L2 =10 mH is connected in parallel with L1. Fi