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A uniform board is leaning against a smooth vertical wall. The board is at an angle above the horizontal ground. The coefficient of static friction between the ground and the lower end of the board is 0.666. Find the smallest value for the angle ?, such that the lower end of the board does not slide along the ground.
A boat moves slowly inside a marina with a constant speed of 1.50 m/s. How fast is the boat moving after accelerating for 5.00s
The differential gear of a car axle allows the wheel on the left side of a car to rotate at a different angular speed than the wheel on the right side. What is the difference between the angular speeds of the wheels on the left and right sides of t..
An electron beam accelerated through a potential difference of 250V, and passes through a small circular hole, What is the diameter of the hole
A charged capacitor is connected to a resistor and switch as in the figure below. The circuit has a time constant of 1.60 s. Soon after the switch is closed, the charge on the capacitor is 90.0% of its initial charge.
An ideal massless spring is hanging vertically. When a 0.45-kg mass is attached to the spring, What is the frequency of the resulting oscillation
A copper plate, with dimensions of 3 cm x 3 cm x 5cm length, width, and thickness respectively, determine the temperature rise in the plate after 10 seconds
A 3 kg block slides with a speed of 1.1 m/s on a frictionless horizontal surface until it encounters a spring. What initial speed should the block have to compress the spring by 1.2 cm
During a cardiac cycle, the heart squeezes about 65g of blood on each contraction into the arterial circulation. what is the maximum force acting on the center of mass of the blood
A He-Ne laser produces light of wavelength 633 nm with intensity 1.02 103 W/m2, over a beam of cross-sectional area 0.940 mm2. How many photons per second are emitted by the laser?
You shine a laser on a plastic prism made from an unknown material and measure the angles relative to the normal that the light takes both inside and outside the medium. What is the index of refraction of the plastic object
A cubic metal box with sides of 19 cm contains air at a pressure of 1 atm and a temperature of 253 K. Find the force due to the internal air pressure on each wall of the box
A wheel rotating about a fixed axis has an angular position given by q = 3- 2.0t3, where q is measured in radians and t in seconds. What is angular acceleration of the wheel at t = 2.00s.
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