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A 700lbf prefabricated slab is being lifted up by a crane at a constant velocity. The crane pulls on the slab with a force of 4000N at an angle of 20o to the left of vertically upward. The only other force acting on the slab is the force of air resistance. What is the magnitude of the force of the air resistance? What is the direction of the force of the air resistance?
Two rubber bands pulling on an object cause it to accelerateat 1.2\;{\rm m}/{\rm s}^{2}. What will be the acceleration of two of these objects glued together if they are pulled by two rubber bands
In the Bohr model of the hydrogen atom, an electron in the 7th excited state moves at a speed of 4.47 104 m/s in a circular path having a radius of 2.59 10-9 m
A photocathode whose work function is 2.5 eV is illuminated by white light of wavelength range from 380 nm to 720 nm. What is the stopping voltage Vnot for this experiment
A charge of -270e is uniformly spread through the volume of a sphere of radius 2.10 cm. What is the volume charge density in that sphere
A spring with a force constant of 3.0 × 104 N/m is initially at its equilibrium length. Find how much work must you do to compress it 0.070 meter
A block of weight 43.6 N is hanging from a rope. The tension from the rope is pulling upward on the block. What is the magnitude of the tension in the rope
A piano weighing 600 lb is to be raised to a platform 4 ft high through a plank 10 ft long. If the coefficient of friction is 0.30, what force parallel to the plank will be needed?
You look at the center of one face of a solid cube of glass on a line of sight that makes a 55° angle with the normal to the cube face. What minimum refractive index of the glass
A small airplane has a mass of 2500 kg and is flying at a speed of 100. m/s at a height of 340 m above the ground. Determine the kinematic energy of the airplane while it is flying
A 12 kilogram object hangs in equilibrium from a string with a total length of 5 meter and a linear mass density =0.0010 kg/m. Compute the tension in the string
A building made of concrete is gauged to be 425 m tall when it is -23°C outside. How much taller will it be when the temperature reaches 41°C? (In cm)
An object of mass 2.5 kg is moving in the negative x direction at a velocity of 2.0 m/s. it experiences a force of 4 N for 3 seconds. What is the final velocity after the object has experienced the impulse?
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