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A trap door, of length and width 2.00 m, is held open at an angle of 65.0° with respect to the floor. A rope is attached to the raised edge of the door and fastened to the wall behind the door in such a position that the rope pulls perpendicularly to the trap door. If the mass of the trap door is 16.4 kg, what is the torque exerted on the trap door by the rope?
A 1400 wrecking ball hangs from a 20 -long cable. The ball is pulled back until the cable makes an angle of 30.0 with the vertical. By how much has the gravitational potential energy of the ball changed?
A 160 km long electric power line made out of copper is installed during the Spring months at an average temperature of 10.7 °C. What is the change in the length of the cable on a -30.4 °C cold Winter day
If 5.0 moles of air is at 0.0 degrees Celsius and 1.0 atm pressure, what is the volume occupied by the gas in m^3
An air-track glider attached to a spring oscillates between the 10.0 cm mark and the 65.0 cm mark on the track. determine the maximum speed of the glider
How long does it take for a golf ball to fall from rest for a distance of 12.0 m? How far would the ball fall in twice that time
Two narrow slits separated by 0.51 mm are illuminated by monochromatic light of wavelength 670 nm. How many bright fringes can be seen on a screen 1.3 cm wide placed 1.1 m in front of the slits.
A magnetic field of 1.1 T is perpendicular to a square coil of 14 turns. The length of each side of the coil is 5 cm. Find the magnetic flux through the coil
A 160 g ball on a 70.70 cm long string is swung in a vertical circle about a point 184 cm above the floor. The string all of a sudden breaks when it is parallel to the ground and the ball is moving upward. The ball reaches a height 543 cm above th..
a beam of light with red and blue components of wavelengths 670 nm and 425 nm respectively strikes a slab of fused
A simple model considers a continent as a block (density ? 2800 kg/m3), estimate the height of the continent above the surrounding mantle rock
A scientist performing UN inspections finds evidence of an abandoned nuclear laboratory. A sample box in the lab reads "pure sample Strontium-90." How long ago was the sample created
A wire 25.1 m long and 6.00 mm in diameter has a resistance of 15.0 m. A potential difference of 28.0 V is applied between the ends. Calculate the resistivity of the wire material
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