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Three forces are applied to a bracket as shown. the directions of the two 30 n forces may vary, but the angle between them is always 50 degrees. Determine the range of values of alpha for which the magnitude of the resultant forces acting on a is less than 120n.
A converging lens of focal length 20 cm is used to form a real image 1.0 m away from the lens. How far from the lens is the object
A person is making homemade ice cream. She exerts a force of magnitude 21 N on the free end of the crank handle on the ice-cream maker, what is the average power being expended
At a recent rock concert, a dB meter registered 130 dB when placed 1.50 m in front of a loudspeaker on the stage. What was the power output of the speaker
A rocket of mass 4.5 x 105 kg is in flight.Its thrust is directed at an angle of 54.0° above the horizontal and has a magnitude of8.90 x 106 N. Find the magnitude and direction of the rockets acceleration. Give the direction as an angle above the hor..
An electron on the axis of an electric dipole is 23 nm from the center of the dipole. What is the magnitude of the electrostatic force on the electron if the dipole moment is 4.0 10-29 C·m? Assume that 23 nm is much larger than the dipole charge sepa..
The mass of the H2 molecule is 3.3x10-24 g. If 1023 hydrogen molecules per second strike 2.0 cm2 of wall at an angle of 45° with the normal when moving a speed of 105 cm/s
A 90 capacitor that had been charged to 30 is discharged through a resistor. The figure (Figure 1) shows the capacitor voltage as a function of time. What is the value of the resistance
Calculate the velocity of the object for an elapsed time.
A man seeking to set a world record want to tow a 109 000 kg airplane along a runway by pulling horizontally on a cable attached to the airplane. The mass of the man is 85 kg, and the coefficient of static friction between his shoes and the runway..
A source of sinusoidal electromagnetic waves radiates uniformly in all directions. What is the electric-field amplitude at a distance of 30.0cm from the source
A capacitor is charged to a potential of 12.0V and is then connected to a voltmeter having an internal resistance of 3.10M(omega) . After a time of 4.10s the voltmeter reads 3.0V . What is the capacitance? What is the time constant of the circuit?
A cube of aluminum has an edge length of 20 cm. Aluminum has a density 2.7 times that of water (1 gram/cm$) and a specific heat 0.217 times that of water (1 cal/g °C). When the internal energy of the cube increases by 47000 cal its temperature increa..
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