An astronaut and his space suit have a combined mass of 157 kg The astronaut is using a soke
repair a solar panel on the International Space Station. When the tether connecting the astronaut to the space
station becomes unattached, the astronaut, still holding the tool kit, starts to float away at 0.2 mis
a) Calculate how far from the space station the astronaut will be after minute. Show your calculations and
include units in your answer
b) Calculate the momentum of the astronaut holding the tool kit as the astronaut floats away. Show your
calculations and include units in your answer.
The astronaut decides the only way to change his motion and move back toward the space station is to throw
the tool kit.
c) Identify the direction the astronaut must throw the tool kit: toward the space station or away from it. Use
the law of conservation of momentum to explain how throwing the tool kit may return the astronaut to the
space station
d) Calculate the velocity with which the astronaut must throw the tool kit in order to float back toward the
space station at 0.1 m/s. Show your calculations and include units in your answer.

An object with initial temperature 130 ∘ f is submerged in large tank of water whose temperature is 50 ∘ f . find a formula for f ( t ) , the temperature of the object after t minutes, if the cooling constant is k = − 0.2 . remember newton's law of cooling (the rate of change of temperature with respect to time is equal to k times the difference between the temperature of the object and the surrounding temperature) ! : )

Fill in the blanks with the numbers is a measure of the resistance to flow. a high liquid has a high resistance to flow and flows slowly. the ancients thought everything in the world was made of 4 we now know that there are 94 naturally occurring and scientists have created another 24 i am certain they will create even more. honey flows slowly because it has a high to flowing. a can be separated by physical means because it contains more than one pure substance and 2 pure substances are not chemically bonded to each other. a cannot be separated by physical means. all matter is made up of all elements are with the same number of protons. if it is just a single or many bonded together, if all of them have the same number of protons, it is an element. in a piece of pure iron metal, all the are joined together, that piece of iron metal is called elemental iron. a single of iron is called elemental iron. a mixture has differences from place to place. we might need a microscope to see them or they might be obvious to the unaided eye. there are surfaces separating it into different phases. a mixture is the same everywhere. it is uniform. there are no surfaces separating it into different phases. if different kinds of atoms (different elements) are bonded together by their electrons, it is called a there are physical means of to isolate the different pure substances in a mixture and there are chemical means of to isolate the different elements in a compound. 1. element 2. compound 3. mixture 4. heterogeneous 5. homogeneous 6. pure substance 7. atoms 8. separation 9. viscosity 10. resistance

Which of the following statement is false ? a.batteries should never be stored on metal trays or outside in the elements)b, battery acid cannot be neutralized)c.do not stack batteries on top of each other)d.never put a damaged battery in a dumpster. i