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suppose 20m long steel rods are used in 20m long slabs. if on a hot day, a speeding 18 wheeler can result an increase in temperature by 25 degrees celcius, calculate the increase of length of a slab due to this speeding 18 wheeler on this hot day.
The four tires on the author's car are inflated to an absolute pressure of 2.7x10^5 Pa. obtain the contact area between each tire and the ground
a rock is thrown downward from the top of a building 168 ft high at an angle of 60 with the horizontal. how far from the base will the rock land
A cannonball (20kg) is shot from a cannon(200kg) with a velocity of 20m/s. what is the backwards velocity of the cannon
Place the light source with the object at 0 cm on the optical rail. Where is the position of the image?
The potential on the axis of a uniformly charged disk at 5.5cm from the disk center is 140V ; the potential 12cm from the disk center is 110V. Find the disk radius in cm
A parachutist and her parachuting equipment have the combined mass of 121 kg. Her terminal velocity is 5.30 m/s with the parachute open. Her parachute has a cross-sectional area of 35.80 m^2. The density of air at that altitude is 1.23kg/m^3. What is..
A 5.00 kg block slides down the inclined plane at 20 angle as shown in the diagram below at a constant velocity. Calculate the net work done by both gravity and friction
The displacement vectors 44.5 cm at 15.0° and 23.0 cm at 51.0° both start from the origin and form two sides of a parallelogram. Find the area of the parallelogram
A 2.9 kg block is released from rest on a 45° inclined ramp. The block will lose energy to friction at a constant rate of 4 J/m as it slides down the ramp
An AC adapter for a telephone answering machine uses a transformer to reduce the line voltage of 120 V to a voltage of 7.00 V. What is the power drawn from the electric outlet
It takes a student t = 7.6 s to push a block m = 11 kg at a constant velocity over a distance of d = 8.2 m. Write an expression for the energy required to move the block along this path in terms of the variables provided
A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.860 m/s encounters a rough horizontal surface of length scripted l = 0.65 m, Find the net work done on the crate while it is on the rough surface
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