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At 18°C, a rod is exactly 20.00 cm long on a steel ruler. Both the rod and the ruler are placed in an oven at 285°C, where the rod now measures 20.21 cm on the same ruler. What is the coeff
A second stone is thrown upward with the same speed 1.250 seconds later. At what time are the two stones at the same height?
During the acceleration there is a tension of 9410 Newton's in the hoisting cable. What does the scale read during the acceleration?
If the heavier block is removed and a downward force of 908 Newton's is supplied by a man pulling on the rope, what is the acceleration of the 412 Newton block? Why are the answers to (a) and (b) di
Ignoring all the frictional forces and assuming the pulley has no mass, find the acceleration of the two blocks, and the tension in the cord.
The sunbather, still wearing the glasses, lies on his side. What fraction of the light intensity received before the glasses were put on now reaches his eyes?
An object 2.15 cm tall is placed 13.5 cm in front of a mirror, which creates an upright image that is 5.30 cm in height. What is the magnification of the image?
The sketch shows a thin film of soapy water of uniform thickness and index of refraction suspended in air. Consider rays 1 and 2 emerging from the film.
A car is driven 155 km west and then 75 km southwest. What is the displacement of the car from the point of origin (magnitude and direction)?
Two devices with capacitances of 18 µF and 7.4 µF are each charged with separate 120 V power supplies. Calculate the total energy stored in the two capacitors.
Two point charges each have a value of 30.0mC and are separated by a distance of 4.00cm. What is the electric field midway between two charges?
The nitrogen molecules at any one place in our atmosphere are at the same temperature. How do the root-mean-square speeds of the two molecules compare?
A dentist uses a small mirror of radius 55 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 20 mm from the tooth, what is the magnification of the image?
It is then pulled down 6.00 and released. What is the time constant if the ball's amplitude has decreased to 2.80 after 48.0 oscillations?
What is the wavelength of a sound having a frequency of 237 Hz travels through air at 485 m/s.
An electron e is released from rest on the central axis of a uniformly charged disk of radius R. Initial acceleration if it is released at distance:
A soccer player applies a force of 72 N to a soccer ball while kicking it. If the ball has a mass of 0.48 kg, what is the acceleration of the soccer ball?
A 0.280-kg ball is dropped from rest at a point 1.35 m above the floor. The ball rebounds straight upward to a height of 0.780 m. What are the magnitude and direction of the impulse of the net forc
An unknown resistor R is connected to a 10.0 Ω resistor, and the combination is attached to an ideal battery. When the two resistors are combined in parallel, they consume 7.90 times as much p
Three point charges,+5.5 μC, +1.6 μC, and -2.5 μC, lie along the x-axis at 0 cm, 2.5 cm, and 5.2 cm, respectively. What is the force exerted on q2 by the other two charges?
How much work is done on the tobaggan by the tension force and how much work is done if the same force is done but parallel to the snow?
The tank springs a very small leak at it's base, and water sprays out a distance of .6 meters from the edge of the table. What is the water level in the tank?
A bat at rest sends out ultrasonic sound waves at 50,000 Hz and receives them returned from an object moving radially away from it at 32.0 m/s. What is the received sound frequency?
If each particle is moving at a speed of 0.15c relative to the laboratory before the collision, determine the energy of the electromagnetic radiation.
You are driving to the grocery store at 20 m/s . You are 110m from an intersection when the traffic light turns red. What acceleration will bring you to rest right at the intersection