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A 140-m-wide river flows due east at a uniform speed of 3.9 m/s. A boat with a speed of 7.8 m/s relative to the water leaves the south bank pointed in a direction 39o west of north. What is the
(a) magnitude and
(b) direction of the boat's velocity relative to the ground? Give the direction as the angle of the velocity from due north, positive if to the east and negative if to the west.
(c) How long does it take for the boat to cross the river?
A car with a mass of 1.50x10^3 kg starts from rest and accelerates to a speed of 18.0 m/s in 12s. Assume that the force of resistance remains constant at 400-N all through this time. What is the average power developed by the car's engine?
Conisder the Earths magnetic field (53 uT) at a point near the equator where the field is horizontal, Calculate the velocity, V of this proton
The fringes observed in a double-slit interference experiment when the two slits are illuminated by white light show dispersion of both light and color, how many bright fringes can be seen on the screen
25% of a radioactive material stays active after 4 hours. What is the half-life of this radioactive material
A point charge with q1 = +1.9 C is located at x = ?3.0 m, y = 0, and a second point charge with q2 = +6.5 C is at x = +1.0 m, y = +2.0 m. (a) What is the force exerted by q1 on q2? magnitude N direction ° counterclockwise from the +x-axis (b) What..
A pump is required to lift a mass of 780kg of water per minute from a well of depth 13.7m and eject it with a speed of 17.9m/s, What must be the power output of the pump
A block starts with a certain speed at the top of a frictionless inclined plane with an unknown angle to the horizontal. To calculate the time required for the block to reach the bottom of the plane.
How far below the top of the well is the surface of the water. If you ignored the travel time for the sound, what would have been the calculated depth.
How much work is needed to move a 120-kg refrigerator.
Obtain the wavelengths in vacuum for blue light whose frequency is 6.46 Ã- 1014 Hz
the time constant of an RL circuit with L=25mH is six times larger than the time constant of an RC circuit with C=55uF. Both circuits have the same resistance R. What is the time constant of the RC circuit?
If the frequency of oscillation of the wave emitted by an FM radio station is 95.8 MHz, determine the wave's period of vibration
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