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A projectile is fired at an upward angle of 45° from the top of a 242 m cliff with a speed of 208 m/s. What will be its speed when it strikes the ground below? (Use conservation of energy.)
Consider a refrigerator with a coefficient of performance 6.1. Suppose the temperature in the room outside the refrigerator is 22 degrees Celsius. What is the lowest temperature (in degrees Celsius)
If the speed of a car is increased by 80%, by what factor will its minimum braking distance be increased, assuming all else is the same? Ignore the driver's reaction time.
A 16.0 kg box is released on a 35.0° incline and accelerates down the incline at 0.272 m/s2. Find the friction force impeding its motion. (N) What is the coefficient of kinetic friction?
A car can decelerate at -4.80 m/s2 without skidding when coming to rest on a level road. What would be the magnitude of its deceleration if the road were inclined at 13° uphill? Assume the same
At a distance from a point charge, the electric potential is 3200 and the magnitude of the electric field is 2.0×105 . What is the distance r?
An alpha particle (charge = +2.0 e) is sent at high speed toward a gold nucleus (charge = +79e). What is the electrical force acting on the alpha particle when it is 2.0 x 10-14 m from the gold nucl
Two narrow slits 50 microns apart are illuminated with light of wavelength 500nm. What is the angle of the m = 2 bright fringe in degrees? What is the highest possible value of the order number m he
A cork floats on the water as a water wave passes by. What happens to the cork? Will the cork's vibrational frequency be related to the water wave's frequency, and if so, how?
Consider a pulsar, a collapsed star of extremely high density, with a mass M equal to that of the Sun (1.98 × 1030 kg), a radius R of only 17.7 km, and a rotational period T of 0.0642 s. By wh
What is the emf of a battery with a 0.19 ohm internal resistance if the battery delivers 1.5A to an externally connected 6.0 ohm resistor?
A box with a weight of 50 N rests on a horizontal surface. A person pulls horizontally on it with a force of 10 N and it does not move. To start it moving, a second person pulls vertically upward on
The distance between an object and the screen is 2.56 m. A converging lens of focal length 25 cm is placed used to cast the image of the object on the screen. Where should the lens be placed?
A copper wire of cross-sectional area3.20 × 10-6 m2 and length 3.60 m has a current of 2.40 A uniformly distributed across that area. (a) What is the magnitude of the electric field (in N/C or
A flywheel is a solid disk that rotates about an axis that is perpendicular to the disk at its center. Rotating flywheels provide a means for storing energy in the form of rotational kinetic energy
Find the magnitude of the angular deceleration of the cylinder.
The second force has a magnitude of 64 N and is directed at an angle ? with respect to the rod. If the sum of the torques due to the two forces is zero, what must be the angle ??
The second force has a magnitude of 6.00 N and acts at a 54.8o angle with respect to the length of the stick. Where along the stick is the 6.00-N force applied? Express this distance with respect to
What is the new rotation rate assuming the child remains at the rim. Ignore frictional forces. Your answer should be given in rev/s to 3 decimal places.
Expand the van der Waals equation in a Taylor series in (V - Vc), keeping the terms through the third degree. Show why, near temperature close to Tc, the critical temperature, the quadratic term can
Please Give all places after decimal A metal wire of mass 57 kg slides without friction on two horizontal rails spaced a distance of 16 m apart. The track lies in a vertical uniform magnetic field o
What is the difference between intersecting snd perpendicular lines? Can two line exist that are not intersecting or parallel? Explain you answer.
An water wave oscillates up and down 5 times each second. The distance between the wave crests is 3m how is the frequency, wavelenght, speed determinded?
An unstable particle called the pion has a mean lifetime of 25 ns in its own rest frame. A beam of pions travels through the laboratory at a speed of 0.575c. (a) What is the mean lifetime of the pio
An 11,000-watt radio station transmits at 880 kHz. Calculate the energy of a single photon at the transmitted frequency.