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Q. A smooth cylinder of radius=10 cm resting on a horizontal surface supports a bar AB of length 30 cm that is hinged at A. The weight of the bar is 50 N. The cylinder is kept from rolling away by a string AO of length 20 cm. Assume all surfaces to be frictionless, find tension in the string.
Q. In a certain vacuum tube, electron evaporate from a hot cathode at a slow steady rate and accelerate from rest through a potential difference of 45 V after that they travel 28cm. as they pass through an array of slits and fall on the screen to produce an interference pattern .If the beam current is below a certain value, only one electron at a time would be in flight in tube. What is this value? In this state, the interference pattern still appears showing that each individual electron can interfere with itself.
Vector A points in the negative y direction and has a magnitude of 3 units. Vector B has three times the magnitude and points in the positive x direction. Find out the direction and magnitude of the following vectors.
A person lifts a 950N box by pushing it up an incline. If the person exerts a force of 350N along the incline, what is the mechanical advantage of incline.
Assume that a 16.5 m/s wind is blowing across the roof of your house. The density of air is 1.29 kg/m3. Conclude the reduction in pressure (below atmospheric pressure of stationary air) that accompanies this wind.
An airplane is flying with a velocity of 85.0 m/s at an angle of 25.0 degrees above the horizontal. When the plane is a distance 117 m straight above a dog that is standing on level ground, a suitcase drops out of luggage compartment. How far from..
Which state is best illustrates kinetic friction
Find out line linking the two point charges
Calculate the acceleration on the radio. The rms voltage across a 5.02 Ω resistor is 34.7 V. Find the maximum instantaneous current by the resistor.
A 340 kg piano slides 3.7 m down a 33° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.37.
Suppose an ideal gas is in a container 3L in volume and allowed to expand by having a piston move. The final volume after the piston moves is 15L. If the gas is at first at a pressure of 1×10^5 Pa and a temperature of 300 K, and temperature is mai..
What is the mass of the liquid in the vat.
An airplane is flying in a horizontal circle at the speed of 542 km/h. If the wings of the plane are tilted 33.0° to the horizontal, what is the radius of the circle in that the plane is flying? Suppose that the required force is provided entirely by..
Two physical pendulums ( not simple pendulum) are made from sticks that are suspended from the ceiling at one end. The sticks are uniform and are identical in all respects, except one is made of wood (mass = 0.17 kg )and the other of metal (mass =..
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