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A 940 N crate is being pulled across a level floor by a force F of 375 N at an angle of 25° above the horizontal. The coefficient of kinetic friction between the crate and the floor is 0.25. Fi
If the magnetic flux through the coil is 8 x 10^-3 Wb, at what rate must the current change in order to induce an emf of 75V?
A uniform magnetic field is decreasing at a rate of 0.23 T/s. What is the magnitude of the induced electric field at a distance of 3.0 cm from the center of the magnetic field?
A moving particle encounters an external electric field that decreases its kinetic energy from 9170 eV to 5120 eV as the particle moves from position A to position B. The electric potential at A is
An archer shoots an arrow toward a 300-g target that is sliding in her direction at a speed of 2.25 m/s on a smooth, slippery surface. The 22.5-g arrow is shot with a speed of 37.0 m/s and passes t
A force of 100 N in a direction of 37 degrees above the horizontal. if the mass of the box and the books is 40 kg, what is the normal force on the box? a. 332 N b. 312 N c. 392 N d. 292 N.
What is the centripetal acceleration of the end of the rod? Answer in units of m/s2
Bonnie and Clyde are sliding 420 {rm kg} bank safe across the floor to their getaway car. The safe slides with a constant speed if Clyde pushes from behind with 450 {rm N} of force while Bonnie pul
What is the final temperature of both the iron and the water? Assume there are no heat losses to the container and environment. Also assume that no water is lost by evaporation.
An electric heater has a Nichrome heating element with a resistance of 12 omega at 20oC. When 114 V are applied, the electric current heats the Nichrome wire to 900oC. What is the operating wattage
A 1.35 kg object is moving in the x direction at 16.4 m/s. Just 3.51 s later, it is moving at 27.8 m/s at 30.0^circ to the x axis. what is the magnitude of the force applied during this time?
A 50.0 g copper calorimeter contains 230 g of water at 20.0°C. How much steam must be condensed into the water if the final temperature of the system is to reach 40.0°C?
The diodes are oppositely oriented, so that when one diode is forward-biased, the other is back-biased. Which phrase best describes the current in the circuit?
A race car starts from rest on a circular track of radius 573 m. The car's speed increases at the constant rate of 0.470 m/s2. At the point where the magnitudes of the centripetal and tangential acc
Design of a Heat Exchanger You have been asked to perform a complete design of a suitable heat exchanger for handling the cooling process in a chemical process dealing with methanol cooling.
Calculate the initial magnitude of the acceleration of the electron.
A laser beam is incident at an angle of 37.0° to the vertical onto a solution of corn syrup in water. (a) If the beam is refracted to 19.44° to the vertical, what is the index of refraction of
The fundamental mode of agiven string under a given tension is at frequency f_1. If we pulled the string four times tauter, what is now the frequency of the new fundamental mode in terms of the old
It has the same speed in the downward direction (assuming air resistance can be ignored). What was the average acceleration vector of the ball?
Two in?nite plates of surface charge are separated by distance d. One plane has surface charge density +σ, and the other has surface charge density -σ. I would like ot know what is the p
A series RLC circuit with L = 15 mH, C = 3.1 F, and R = 4.7 is driven by a generator with a maximum emf of 120 V and a variable angular frequency 8700. Find phase angle (in degrees).
A bird sitting in a tree is traveling at 30 km/s relative to the faraway Sun. When the bird drops to the ground below, does it still go 30 km/s, or does this speed become zero?
What must the charge (sign and magnitude) of a 1.55 particle be for it to remain balanced against gravity when placed in a downward-directed electric field of magnitude 680?
A cannonball shot with an initial velocity of 143 m/s at an angle of 56° follows a parabolic path and hits a balloon at the top of its trajectory. Neglecting air resistance, how fast is the can
When the power switch is turned off, you observe that the wheel stops in 45.0 s with constant angular acceleration due to friction at the axle. What torque does friction exert while this wheel is sl