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Two people, one of mass 75 and the other of mass 65 , sit in a rowboat of mass 89 . With the boat initially at rest, the two people, who have been sitting at opposite ends of the boat, 2.6 apart from each other, now exchange seats. How far will the boat move? Express your answer using two significant figures.
Two runners compete in a race of 10.04 km. One runner has a steady speed of 11.14 km/h. What is the difference in time for the two runners
According to Equation 20.7, an ac voltage V is given as a function of time t by V = V0sin(2?f t), what is the smallest value of the time at which the voltage equals one-fourth of the peak value
An intergalactic rock star bangs his drum every 1.70s. A person on earth measures that the time between beats is 2.5s. How fast is the rock star moving relative to earth.
Two cars have collided at right angles at an intersection: Car A was eastbound; car B was northbound. The marks on the pavement show that the vehicles both moved together in the same direction immediately after the collision. That direction was at..
Water can hold 36 grams (g) of salt in every 100 milliliters (mL). The ocean contains 3.6 g of salt in every 100 mL. As a solution, which is seawater.
The position function x(t) of a particle moving along an x axis is x = 4.5 - 4.5t2, with x in meters and t in seconds.
A 55.6 kg child slides down a water slide with a velocity of 0.9 m/sec at the top. At the bottom of the slide, she is moving horizontally, y=1.5 meters above the water. She splashes into the water d=2 meters to the left of the bottom of the slide.
A 40 kg child sits in a swing suspended with 2.5 m long rope. Use energy conservation to determine the speed the child will have at the bottom of the arc when she is let go
The current in a 69-? resistor is 0.15 A. This resistor is in series with a 37-? resistor, and the series combination is connected across a battery. What is the battery voltage
A 78-kg base runner begins his slide into second base when he is moving at a speed of 4.2 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches base.
An electron with a speed of 5.50×10^6 m/s, collides with an atom. What is the speed of the electron after the collision
problem 1two horses pull horizontally on ropes attached to a stump. the two forces texttipvec f1f1vec 1230rm n and
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