Physics, 08.03.2020 01:44 Sadaalcala1
1. You hit your hand on a desk and it doesn't hurt that much. The next day you
are carrying a heavy backpack in your hand and you hit the same desk. This
time your hand hurts a lot when you hit the desk. Explain why your hand
hurt the second time using concepts discussed in class.
2. You are holding an apple over your head. Draw a free-body-diagram. A free-
body-diagram is when you draw all the forces acting on individually objects
that are free floating in space not touching anything else.
3. After a while, your hand/arm gets tired so you let go of the apple. Now the
apple is falling through the air. Draw the free-body-diagram (and all the
forces that are acting on the apple now).
4. If the apple has a mass of 0.8 kg, calculate the force due to gravity of the
apple while it is falling through the air.
5. A box with mass (m) = 2 kg) has an acceleration of 5 m/sec2. Calculate the
total force acting on the box.
6. Suppose that an astronaut outside pushes on a spaceship. The astronaut
creates a force of 36N. If the mass of the spaceship is ms = 11,000kg, calculate
the acceleration of the spaceship.
7. The astronaut forgot about Newton's 3rd law. The moment they push on the
spaceship, they start to accelerate backwards. If the astronaut has a mass of
ma = 92 kg, calculate the acceleration of the astronaut using information from
Answers: 1
Physics, 22.06.2019 01:30
Ablock of mass 1.5 kg slides down an inclined plane that has an angle of 15. if the inclined plane has no friction and the block starts at a height of 3 m, how much kinetic energy does the block have when it reaches the bottom? acceleration due to gravity is g = 9.8 m/s2. a. 6.8 j b. 50.9 j c. 0 j d. 44.1 j
Answers: 1
Physics, 22.06.2019 10:40
As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.
Answers: 1
Physics, 22.06.2019 13:00
4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?
Answers: 1
Physics, 22.06.2019 19:50
The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.
Answers: 3
1. You hit your hand on a desk and it doesn't hurt that much. The next day you
are carrying a...
are carrying a...
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