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A 5300 kg helicopter hovers at a fixed height. The rotor blades send air downward at 62 m/s. What mass of air must pass through the blades every second to produce enough thrust to hold the helicopt
If the angle of each of these wires is reduced to 79 degrees, what new force does each wire exert?
Derive a result for the frequency of the string if you know the tension (T), linear density (m), number of antinodes (n), and the length L?
Neglecting both the transverse component of the velocity and the effect of gravity in accelerating the motion, estimate when the two galaxies will collide.
On a workday the average decibel level of a busy street is 82 dB, with 100 cars passing a given point every minute. If the number of cars is reduced to 15 every minute on a weekend, what is the dec
IP Halley's Comet Halley's comet, which passes around the Sun every 76 years, has an elliptical orbit. When closest to the Sun (perihelion) it is at a distance of 8.823 x 10^10 m and moves with a s
The gravitational force exerted on a baseball is 2.23 N down. A pitcher throws the ball horizontally with velocity 14.5 m/s by uniformly accelerating it along a straight horizontal line for a time
In a Rotor-Ride at a carnival, riders are pressed against the inside wall of a vertical cylinder 2.00 m in radius rotating at 1.10 revolutions per seconf when the floor drops out. what is the speed
A 60 turn coil of radius 4.8 cm rotates in a uniform magnetic field having a magnitude of 0.51 T. If the coil carries a current of 35 mA, find the magnitude of the maximum torque exerted on the coi
A light bulb in a 120 V circuit is switched on, and a current of 0. .25 A flows through the filament. What is the resistance of the bulb?
A proton orbits a long, uniformly charged wire, making 1.0×10^6 revolutions per second. The radius of the orbit is 1.0 cm. What is the wire's linear charge density?
A 10.0 g bullet is fired horizontally into a 109 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring of constant 160 N/m.
Particles P1 and P2 are located in three dimensional space at the points (2.00, -3.50, 1.75) mm and (-3.50, 2.25, -2.00) mm. These particles carry charges of +3.00 μC and +4.50 μC respectivel
A 420 turn solenoid of length 31.0 cm and radius 2.90 cm carries a current of 5.10 A. Find the following.
Two balls of radius 2.00 mm have a separation between their centers of 5.33 cm. The same electric charge is placed on both balls so that there is a repulsive force between them of 2.75 N. Assume th
Let the masses of blocks A and B be 4.00 kg and 2.00 kg, respectively, the moment of inertia of the wheel about its axis be 0.400 kg*m^2, and the radius of the wheel be 0.140 m. Find the linear acc
The atmosphere of Mars is mostly (molar mass 44.0 under a pressure of 650 , which we shall assume remains constant. In many places the temperature varies from 0.0 in summer to - 100 in winter. Over
Is the wave(s) generated a finite compression shock wave or a series of expansion waves?
A 2.40 MHz sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward the sound receiver as the heart beats
What is the magnitude of the acceleration of a proton that is 1.0 from the center of the bead?
Two large, parallel, conducting plates are 28 cm apart and have charges of equal magnitude and opposite sign on their facing surfaces. An electrostatic force of 6 * 10-15 N acts on an electron plac
A carton of egg rests on the seat of a car moving at 22.5 m/s. What is the least distance in which the cart can be uniformly slowed to a stop if the eggs are not to slide? The coefficient of fricti
As great as smartphones are, one of the main gripes about them is that they need to be recharged too often. Suppose my Samsung Galaxy S2 requires about 0.4 W to maintain a signal and data connectio
A car of mass 960 travels at a speed of 30 along a straight road. The driver sees a red traffic light ahead, and applies the brakes. The coefficient of friction between the car tyres and the road is