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You want to build a raft that can hold you (86 kg) plus some supplies (41 kg) for a long trip. You decide to make the raft out of logs that are each 23 cm in diameter and 3.1 m long. If the density of each log is 610 kg/m3, how many logs do you need? in logs (enter in an integer number).
A 47 g block of copper at -10 C is added to 150 g of water in a 71g aluminum cup. The cup and the water have an initial temperature of 4.2 C. Find the equilibrium temperature of the cup and its contents. What mass of ice, if any, is present when t..
Earth is farthest from the Sun in July and closest to Sun in January. During which Northern Hemisphere season is Earth moving fastest in its orbit.
The security alarm on a parked car goes off and produces a frequency of 1200 Hz. The speed of sound is 343 m/s. At what speed are you driving
You pull your 55.00 kg friend on a 5.00 kg sled across a patch of snow. You pull using a 48-N force on a rope that makes a 35 degree angle with the horizontal. If the friction force between the sled and the snow is a mere 5-N what is the normal fo..
A ball is at the top of a ramp that is 4.5 m above a table. If the ball rolls without friction, how fast is it going at the bottom of the ramp
A radioactive sample produces 5120 decays at one point in an experiment and 40.96 minutes later produces 320 decays per minute. What is the half life
Two boxes, m1 = 1.0 kg with a coefficient of kinetic friction of 0.10, and m2 = 2.0kg with a coefficient of 0.20, are placed on a plane inclined at 0 = 30o.
The vector A s 3.50cm long and is directed into this page, In the right-handed coordinate system, where the +x-axis directed to the right, the +y-axis toward the top of the page
Jupiter makes one complete orbit of the Sun every 11.9 years. Calculate the radius of the orbit of Jupiter
A town is planning on using the water flowing through a river at a rate of 5.0 x 106 kg/s to carry away heat from a new power plant, What is the maximum power this plant can produce
Which of the following is not a valid criterion for the acceptance of a physical law or theory?
You are a member of a production crew filming a nature explorer in the Rocky Mountains. Calculate the time the explorer spends in the water if the river is 90.7 feet wide
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