1. As mentioned before, our asteroid is in the shape of a sphere and has a mass of 1000 kilograms. Determine the density (in grams per cubic centimeter) of this asteroid if its diameter is known to be 1.0 meters. Useful information: 1 kg = 1000 g, 1 m = 100 cm, volume of sphere = 4/3 p r3. Remember that the radius of a sphere is equal to half its diameter! Show all of your work.
2. How does your calculated density (in grams per cubic centimeter) compare to the density of water? Would you expect this asteroid to float or sink in water based on your calculations?
3. One side of our asteroid is constantly illuminated by the Sun while the other side remains in the dark. Do you expect there to be a temperature difference between the light and dark sides? Explain why or why not. If the two sides are at different temperatures, how might heat transfer from one side to the other? Note that our asteroid does not have enough gravity to hold an atmosphere.
4. Occasionally an asteroid will break into fragments due to a collision. These fragments can leave the asteroid belt and some even make their way to Earth. Upon entering the Earth's atmosphere, a fragment is heated to high temperature by frictional forces. What would happen to any water-ice contained within a fragment? Is this type of change considered a chemical change or a physical change? Is this an endothermic or exothermic change? Explain.
6. If the asteroid fragment contains carbon, it may burn when entering the Earth's atmosphere. What is the most likely compound to result from this process? Which type of chemical bond would result from this process? Of the two broad classes of chemical reactions mentioned in this course, which type would this be? Be sure to fully explain all of your answers.© BrainMass Inc. brainmass.com October 17, 2018, 10:21 am ad1c9bdddf
Radius = 1/2 diameter
Density = Mass / Volume = 1000kg / (4/3 x pi x 0.5^3)
Density = 1910.828 kg/m^3
Converting to g/cm^3 for next question:
1 m^3 = 100cm x 100cm x 100cm = 1000000 cm^3 (remember that cubed means there are 3 dimensions, so I converted all 3 dimensions)
2) Water's density = 1.0 g/cm^3
Since the asteroid is denser than water, it will sink.
Only when a substance is lighter than the medium it exists in will it float/rise to the top. It will stop rising and stay at a certain level when it encounters another medium that is less dense than it. This is why ice cubes, which are less dense than liquid water, will float ...
Asteroid physics problems are examined. The density for float or sink are determined.
Physics Problems College Level 1 (Momentum and Collisions)
Show all steps (all questions):
1)Impulse and momentum change/varying force. A 10-kg asteroid is traveling through space at 2 m/s toward a spaceship. To avoid a collision, an astronaut, with the help of a backpack rocket, exerts a force of 20 N on the asteroid in the opposite direction for 5 s. (a) find the asteroid's final speed?
(b) How long should she have pushed in order to just stop the asteroid?
2) Conservation of linear momentum. A toy cannon having a mass of 4.0 kg sits on a frictionless level surface. It fires a 250-g projectile horizontally and immediately recoils westward at 1.5 m/s. (a) Find the change in momentum of the cannon? (b) Determine the change in momentum of the projectile? (c) What was the muzzle velocity of the projectile?
3)A fireworks rocket rises straight up to its maximum altitude of 50.0 m. At that point it explodes into two equal-mass pieces; one heads straight down at 20.0 m/s, the other travels straight upward. What is the maximum altitude attained by the second upwardly-moving fragment?
4) Collisions> In an arrangement for measuring the muzzle velocity of a rifle or pistol, the bullet is fired up at a wooden mass, into which it imbeds. The wood is blasted straight up into the air to a measured height h. Assuming negligible losses to friction, write an expression for the velocity in terms of the known masses and height. If a 100-grain (6.48-g) 25-06 Remington rifle bullet is fired into a 5.00-kg block that then rises 4.0 cm into the air, what was the muzzle speed of that bullet?
5)A soft clay block is suspended so as to form a so-called ballistic pendulum. A bullet is fired point blank into the block, imbedding itself therin and raising the latter to a height h. Write an expression for the muzzle speed of the bullet in terms of g, h, and the masses. Note that although the friction on the pendulum is negligible, clay-bullet friction losses are not, and mechanical energy is not conserved in the collision.
6)Referring to the above problem, Derive an expression for the percentage of kinetic energy converted into internal energy during the bullet-clay impact.