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Question1
A child in danger of drowning in a river is being downstream by a current that has a speed of 2.25 km/h. The child is 0.530km from shore and 0.825km upstream of a boat landing what time a rescue boat sets out. If boat proceeds at its greatest speed of 18.9km/hr relative to the water, what angle (in degrees) does the boat velocity make with shore?
How long does it take the boat to reach the child?
Question2
An airplane is flying horizontally with the speed of 800 km/h (220 m/s) when an engine falls off. Neglecting air resistance, assume it takes 26 s for the engine to hit the ground.
a) Find out the altitude of the plane.
b) Find out the horizontal distance that the aircraft engine falls..
c) If an airplane somehow continues to fly as if nothing happened, where is an engine relative to the airplane at the instant the engine hits the ground?
A light commuter rail train usually accelerates at a rate of 2.15 m/s^2 and usually decelerates with a rate of 3.20 m/s^2, The train can stop in 10.5 seconds from its top speed in an emergency. How far would it travel during this braking period
A 1500 -kg automobile travels at a speed of 75 -km/h along a straight concrete highway. Faced with an emergency situation, the driver jams on the brakes, and the car skids to a stop.
A van with a mass m(v) moves along a frictionless road at v0 m/s when some heavy luggage is added to the top that weighs m(l) onto the roof
The direction angle of a vector is defined as its positive angle relativeto the positive x-axis.
A projectile is launched with a launch angle of 65° with respect to the horizontal direction and with initial speed 14 m/s. what launch angle produces the longest time of flight
An automobile transmission has 175 hp of power entering from the engine, 167 hp leaving to the wheels, while losing 5000 Btu/hr to the surroundings as heat.
question1imagine drawing two equipotentials in plane of the figure one passing through point a and one passing through
A target glider, whose mass m2 is 320 g, is at rest on an air track, a distance d = 53 cm from the end of the track. A projectile glider, How much more time elapses before the gliders collide again
find magnitude of the tension in the wire and magnitudes.
Two small plastic spheres, one charged to -25 nC and the other to +25 nC , are connected by a 28-mm-long insulating rod. What is the maximum possible torque on the dipole
Water is flowing through a pipe with a constriction. The diameter of the narrow section is one-third the diameter of the wide section. what is the velocity of the fluid in the wide section
Two capacitors are connected in a parallel combination. C1=6.0 x 10^-6 farad and C2= 3.0 x 10^-6 farad.the voltage applied to the combination is 120 volts. determine the charge that is stored on capacitor C2.
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