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Your older twin, born only 15.0 minutes before you, boards a spaceship and travels out among the stars at 2.437 x 10^8 m/s. According to your watch, they spend 60.0 minutes travelling at that speed. When they get back to Earth, they are no longer 15 minutes older than you. Who is older than who now and by how much?
An 70 box of oranges is being pushed across a horizontal floor. As it moves, it is slowing at a constant rate of 0.90 each second. The push force has a horizontal component of 20 and a vertical component of 25 downward. Calculate the coefficient of k..
two circular hoops with masses and radii in the ratios m2m14 and r2r14 rotate with angular speeds in the ratio ?2?12.
A skier slides horizontally along the snow for a distance of 21 m before coming to rest. how fast was the skier going
The two blocks of masses M and 2M shown to the right initially travel at the same speed v but in opposite directions. How much mechanical energy is lost to other forms of energy during the collision
Joey weighs 77 lb and sits on a seesaw at a distance of 30 inches from the fulcrum. Jenny weighs 67 lb and sits on the opposite side of the seesaw at a distance of 48 inches from the fulcrum. how far away from the fulcrum should he sit
The pulley is located so that the string makes a 45 degree angle with the beam. The beam is uniform, 5 meters long, and has weight. The professor stands 2 meters from the pivot point and has weight.
A -2.3nC charge is on the x-axis at x1 = -7cm and a 2.5nC charge is on the x-axis at x2 = 11 cm. At what points on the y axis is the electric potential zero
How would you devise a workflow to ensure that the specimen was correctly identified and the laboratory workers safely and efficiently worked with the specimen collected?
Two slits are separated by 0.270 millimeter. A beam of 570 nm light strikes the slits, producing an interference pattern. Find the number of maxima observed in the angular range
A skier moving at 4.60m/s encounters a long, rough horizontal patch of snow having coefficient of kinetic friction 0.220 with her skis. How far does she travel on this patch before stopping?
What did Newton discover about gravity? 1. All objects near the Earth free fall with the same acceleration. 2. Any force on a planet would be directed along its path. 3. Gravity only happens on Earth.
A sample of a radioactive isotope has an initial activity (at time t = 0) of 0.500 mCi. At time t = 51.2 d the activity is 0.387 mCi. Compute the half-life of this isotope.
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