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A 0.482-kg toy car is powered by one D cell (1.50 V) connected directly to a small DC motor. The car has an effective energy conversion efficiency of 47.1%, meaning that 47.1% of the electric energy applied to the motor is converted into translational kinetic energy. After 7.15 seconds, the car, which is initially at rest, reaches a speed of 2.89 m/s. What is the average current supplied to the car\'s motor.
two motorcycles are traveling due east with different velocities. however 5.70 seconds later they have the same
An air-filled toroidal solenoid has a mean radius of 15.0 and a cross-sectional area of 5.02, What is the least number of turns that the winding must have
A projectile is launched with aninitial speed of 60 m/s at an angle of 60 degrees. It lands on ahillside 4 seconds later. What is the straight line distance to where it lands
A platinum resistance thermometer has resistances of 190.0 when placed in a 0°C ice bath and 234.8 when immersed in a crucible containing a melting substance. What is the melting point of this substance?
A gas expands, changing its volume by +4.24×10-4 m3 while at a constant pressure of 6.44×105 Pa. What is the work done by the surroundings on the gas
A 5.0 megawatt windmill has three 45 m-long blades that can be approximately viewed as straight rods. If the rotational speed of the rods is 6 rpm, what is the mass of each rod
How many wavelengths are contained in the light wave passing back and forth through the oil?
A rectangular loop is located in a uniform magnetic field of magnitude 0.31 T directed perpendicular to the plane of the coil. what is the magnitude of the emf induced in the coil
the motion of a projectile fired at t0. it initial speed is 50 ms and its initial projection angle is 45 degree from
A 2.3cm high object is located 30cm from a diverging lens, whose focal length is 14cm. What is the height of the image produced by the lens
q1. a box is sliding up an incline that makes an angle of 27.7 deg regarding the horizontal. the coefficient of kinetic
A convex lens of 10 cm focal length is placed in contact with a convex lens of 15 cm focal length. What is the focal length of the combination
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