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two girls go fishing in row boat. joy whose mass is 65kg jumps straight off the front of the boat with speed of 2.00m/s relative to boat, while megan proples her 68 kg body off the back of the boat at 4.00m/s relative to the boat. if the 100kg boat is traveling forward at 3.00m/s, what is its velocity after both girls jump?
question when a 2.50 kg object is hung vertically on a certain light spring described by hookes law the spring
A "sun yacht" is a spacecraft with a large sail that is pushed by sunlight. Although such a push is tiny in everyday circumstances, What is the magnitude of the resulting acceleration, If the craft starts from rest
By what factor does the resistance of a copper wire change if its length doubles and its diameter triples? (If the resistance doubles, enter "2"; if it decreases by a factor of three, enter "1/3", etc.)
A +5.0-microC charge experiences a 0.46-N force in the positive y direction. If this charge is replaced with a charge-2.7-microC, find the magnitude of the force in this case.
the old diefunbunker near ottawa has two identical air-raid sirens 5 meters apart horizontally and producing sound in
Liquid-detecting prism devices may be used in a washing machine or other liquid-containing devices. If no liquid covers the prism's hypotenuse, total internal refletion from the light source produces a large signal in the light sensor.
The locomotive is moving at 25 km/h. The engineer of the high speed train immediately applies the brakes. What must be the magnitude of the resulting constant deceleration if a collision is to be just avoided.
A concave cosmetic mirror has a focal length of 24 cm. A 5.0 cm -long mascara brush is held upright 12 cm from the mirror.
In the Bohr theory of the hydrogen atom, an electron moves in acircular orbit about a proton, where the radius of the orbit is.529X10^-10meters. (a), find the electric force between the two.(b) If this force causes the centripetal acceleration of the..
steel train rails are laid in 12m long segments placed end to end. the rails are laid on a winter day when their
there are a total of four pulleys. one pulley is on the 20 degree mark with 90 gm grams per meter over it. another
Object at rest, height in 180 feet Consider the following free fall classical motion and answer these questions based on the information. What is the classification of this motion and why
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