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A child is in danger of drowning in the Merimac river. The Merimac river has a current of 3.1 km/hr to the east. The child is 0.6 km from the shore and 2.5 km upstream from the dock. A rescue boat with speed 24.8 km/hr (with respect to the water) sets off from the dock at the optimum angle to reach the child as fast as possible. How far from the dock does the boat reach the child?
d =
A person consumes a meal containing 17 kcal. What is the power this meal produces if it is to be "burned off" due to exercise in 6 hours
A wire 2.45 m long carries a current of 19.2 A and makes an angle of 48.8° with a uniform magnetic field of magnitude B = 1.18 T. Calculate the magnetic force on the wire
Consider a tungsten filament in a light bulb. After the bulb has been on for an hour, how has the resistance in filament changed (if at all).
A 310 turn solenoid with a length of 18.0 cm and a radius of 1.30 cm carries a current of 1.70 A. Calculate the change in the magnetic flux through the 4-turn coil during the same period
A 330-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 34° with the horizontal
A 380 kg piano slides 3.9 m down a 27 incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. Determine the work done by the man on the piano
In order to determine a newly developed material's specific heat conduct, material scientists conduct an experiment. what is the specific heat of the unknown
A 60 ohm resistor is connected in series with a 30x10^-6 capacitor and a generator having a maximum voltage of 120 volts, what is the phase angle of the circuit
Two round rods, one steel and the other copper, are joined end to end. Each rod is 0.795m long and 1.85cm in diameter. The combination is subjected to a tensile force with magnitude 3950N.
A 20-kg sled is pushed up a 34° slope to a vertical height of 140 m. A constant friction force of 50 N acts for the entire distance. What external work was required
An electron is accelerated from rest through a potential difference of 3750 V. Calculate the radius of the path it will follow
White light is the incident from air onto a transparent material at an angle of 40 degrees. What are the indices of refraction for the two colors
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