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Sheena can row a boat at 3.10 mi/h in still water. She needs to cross a river that is 1.11 mi wide with a current flowing at 1.77 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head 60.0° upstream. a) What is her speed with respect to the starting point on the bank?
(a) How long does it take her to cross the river?
(b) How far upstream or downstream from her starting point will she reach the opposite bank? (magnitude and direction)
A 121 cm length of string has a mass of 2.40 g. It is stretched with a tension of 6.80 N between fixed supports. What is the lowest resonant frequency of this string
A battery with an emf of 12.0 V shows a terminal voltage of 11.0V when operating in a circuit with two lightbulbs rated, What is the battery's internal resistance
The Tevatron at the Fermi National Laboratory can accelerate protons to a kinetic energy of 1 TeV. In one particular experiment the kinetic energy of the protons is 650 GeV. What is the de Broglie wavelength of these protons
Two converging lenses (f1 = 9.00 cm and f2 = 6.00 cm) are separated by 18.0 cm. The lens on the left has the longer focal length. Locate the final image relative to the lens on the right
A 5-kg rock is dropped off a 30-m high building. If the rock is dropped from rest, what is the average power supplied by gravity
A projectile is fired at time t = 0.0 s, from point 0 at edge of a cliff, with initial velocity components of vix=30m/s and viy = 100m/s. The projectile rises, and then falls into the sea at point P. The time of flight of the projectile is 20s.
Three 1.5-V batteries, with internal resistances of 0.01ohms , 0.1ohms , and 1ohms , what is the voltage across each resistor
Two unequal point charges q1 and q2 are held in place unconnected from each other. A point charge Q is placed somewhere between them at a point where it remains stationary when free. From this observation, we can conclude that q1 and q2 must eithe..
A diving board of length 3{rm m} is supported at a point 1 {rm m} from the end, and a diver weighing 550 {rm N} stands at the free end. The diving board is of uniform cross section and weighs 295 {rm N}. Find out the magnitude of the force at the ..
The origin of the coordinate system and with a label at their heads. Two of these vectors are given in terms of the unit-vectors I and j as
One end of a horizontal rope is attached to a prong of an electrically driven tuning fork that vibrates at a frequency 125Hz, What is the speed of a transverse wave on the rope
A surface completely surrounds a 3.5 × 10-6 C charge. Find the electric flux through this surface when the surface is (a) a sphere with a radius of 0.59 m, (b) a sphere with a radius of 0.16 m, and (c) a cube with edges that are 0.27 m long.
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