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What is the specific heat of a metal substance if 128 kJ of heat is needed to raise 6.1 kg of the metal from 20°C to 30°C?
A uniform rod rotates in a horizontal plane about a vertical axisthrough one end. The rod is 6.00?m long,weighs 11.0?N, and rotatesat 210 rev/min clockwisewhen looked at from above.
The blood flow speed through an aorta with a radius of 1 cm is 0.28 m/s. if hardening of the arteries causes the aorta to be constricted to a radius of 0.8 cm, what is the new blood flow speed?
two protons are moving directly toward one another. when they are very far apart their initial speeds are 1.40 x 104
The electric potential V in the space between two flat parallel plates 1 and 2 is given (in volts) by V =1160x2, Find the magnitude and direction of the electric field at x = 3.2 cm
A 35.1 kg girl and a 58.4 kg boy are on the surface of a frozen lake, 14.5 m apart. Calculate the magnitude of the girl's acceleration
A woman is standing in an elevator holding her 2.8kg briefcase by its handles. calculate the downward pull of the briefcase on the woman's arm while the elevator is accelerating. Acceleration is downward at 2.5 m/s^2.
In San Francisco a very simple technique is used to turn around a cable car when it reaches the end of its route. The car rolls onto a turntable, what is the magnitude of the net torque applied to the car
A charged object has two forces acting on it: F1 (4 Newtons, pointing up at 120 degrees from the positive x axis), Compute the total (net) force acting on the object
a ball of mass 0.340 kg moving east x direction with a speed of 3.00 ms collides head-on with a 0.520 kg ball at rest.
The refractive index of a transparent material can be determined by measuring the critical angle when the solid is in air. If ?c= 42.0° what is the index of refraction of the material?
A car with a total mass of 1.65*103 kg has wheels ofradius 35.0 cm and moment ofinertia 0.760 kg ·m2. Suppose that the wheels were then replaced byoversized wheels of the same shape and made of the same materials,but 49% wider and witha 49% larger..
A worker drops a hammer from a ledge that is 41.1 meters above the ground. How long does he have to warn the people on the ground?
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