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A 1486-kg car is moving westward with a speed of 20.3 m/s, and a 2898-kg truck is traveling east with a speed of 17.8 m/s. Find the velocity of the center of mass of the car-truck system. Assume that the "positive" direction is to the east.
How long does the total trip last
This primary line is connected to a transformer. The primary has 450,000 turns. What is the number of coils on the secondary if the Vrms delivered to the user is to be 110V
A 3-m2 hot black surface at 80°C is losing heat to the surrounding air at 25°C by convection with a convection heat transfer coefficient of 12 W/m2.°C, Determine the total rate of heat loss from the surface
Two poles, one of which is 5 times as strong as the other, exert on each other a force equal to 0.8x10^-3 kgf, Find the strength of each pole
A child throws a ball downward from a tall building. Note that the ball is thrown, not dropped and disregard air resistance. What is the acceleration of the ball immediately after it leaves the child's hand
A source traveling to the right at a speed of 11.30 m/s emits a sound wave at a frequency of 104.0 Hz. The sound wave bounces off of a reflector, which is traveling to the left at a speed of 4.95 m/s. What is the frequency of the reflected sound w..
In the Bohr model of hydrogen, the electron moves in a circular orbit around the nucleus. Determine the angular speed of the electron
A 0.390 kg iron horseshoe that is initially at 745 °C is dropped into a bucket containing 24 kg of water at 46 °C. What is the final equilibrium temperature? Overlook any heat transfer to or from the surroundings.
A spider has a mass of 0.70-g and is hanging from rest on a 20-cm long thread of 0.0020-mm diameter of silk, If the string is whirled in a circle at a rate of 2 revolutions per second, what is the minimum and maximum time for vibrational information..
How several meters away is a cliff if an echo is heard 0.587 s after the original sound? Assume that sound traveled at 343 m/s on that day.
In vacuum, two charged particles lie 2.5 cm apart. Find the magnitude and direction of the electric field at a point midway between the two particles. (One has a charge of -8.0 µC and the other has a charge of +4.0 µC.) Magnitude.
A motor pulls a ski tow rope moving 10 skiers at a time (each 75kg) up a slope of 20 degrees at a constant 2m/sec speed. find the minimum power the motor must have to accomplish this
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