science quiz nerd physics fun?

Question

1.identify the following as a fundamental or derived unit
mass
year
density
weight
2.The mass of a giraffe on the moon would be
A.less than its mass on jupiter
B.The same as its weight on the moon
C.more than its mass on jupiter
D.none of the above
3.A jar contains 40 mL of glycerine (mass 37.8 grams) and 60 mL of corn syrup (mass 82.8 grams). which of the substances is on top? how do u know?
4.A.If a book remains stationary on a table are the forces acting upon the book in equilibrium?
B.what is the resulatant of the forces acting upon the book?
5.what are newtons three laws? write the laws in your own words and state an example of each.
A.second law:
B.third law:
6.If a car travels 65 mph how far will the vehicle travel in 3.5 hours?
7.If you run at a speed of 10 mph and cover a distance of 25 miles how long have u been running?
8.An airplane flies for 3 hours and covers 1500 miles. what is the speed of the plane?
9.speed for 125 miles in 6.25 hours?
have fun!

Answer 1

What is this, your take home test you lazy bum. Do your own work.

Answer 2

1- The mass is fundamental

2- The mass does not change; only the weight canges; therefore the answer is D.

3-Mass/volume = density. For glycerin density = 0.0037.8/0.0040= 0.995
Density for the syrup = 82.8/60= 1.38
The glycerin is on the top because its density is lower than the syrup.


4-Yes the forces acting on the book are in equilibrium because the book is stationary.
The resultant of the forces acting on the book is = 0.0 Newton


5-The three Newton's laws are:

A- The law of inertia which states that any body of any certain mass moving in space remains in moving state unless other force or forces in different directions act on the body and causes changes in its inertia.

B- If a certain force acting on a body and causing it to move, the body will experience a continuous acceleration equals to the amount of force divided by its mass. A simple representation of this force is F = ma. Or, F = m*dv/dt.

C- For each action there is a reaction equals in measure and opposite in its direction.

Example of each: A satellite continues to orbit the Earth steadily unless a new force acts on the satellite and causes its change in its Inertia.

Example of B-Applying a force on a certain aircraft will result in a continuous acceleration of the aircraft until the forces of the drag becomes equal to the thrust at which point the acceleration of the aircraft becomes zero and the velocity remains constant. This is in line with the equation F = ma

Example of C- A rocket will move upwards in space when certain amount of mass is forced out of its nozzle. The force that moves the rocket upward resulted from the reaction of the force of the fluid being exhausted out of the nozzle thrust of the rocket is equal:
m dv/dt = u dm/dt. Where u is the velocity of the fuel, and v is the velocity of the rocket

6- 65 *3.5 = 227.5 miles

7- 25/10 = 2.5 hours

8- 1500/3 =500 miles an hour

9- 125/6.25 = 20 miles/hour

Answer 3

1) mass is fundamental; the rest are derived
2) A
3) the glycerine is on top because it has a lower density. Density of glycerine = 37.8g/40mL = .95. Density of corn syrup = 82.8g/60mL = 1.38. Lower density things float on heavier ones.
4) Yes. The forces are the force of gravity pulling it down versus the strength of the table to resist gravity. B) since they are in equilibrium, the book stays in the same place until another external force acts on it, like picking it up, the table dissapearing, etc.
5)law 1: an object at motion or rest will remain so until acted on by an outside force. See the book example above. A ship in space will stay travelling in the direction it started in until it crashes into something or applies it rockets.
law 2: the rate of change of momentum is proportional to an object's accelleration. If a cueball on a pool table gets hit softly by another ball head on, the first ball will move in the same direction as the ball that hit it at roughly the same speed as the second ball. A glancing blow will create a movement at some angle.
law 3: all forces occur in pairs and are equal and opposite. if you shoot a gun it kicks back in some degree equal and in opposite direction to the energy leaving the bullet.
6) 65 mph x 3.5 hrs = 227.5 miles
7. 25 miles/10 mph = 2.5 hrs
8) 1500 mi/3 hrs = 500 mph
9) 125 mi/6.25 hrs = 20 mph

Answer 4

1.mass- amount/size of an object
year- the measured time of a celestial body in orbit and said time to make 1 full revolution.
density- amount of matter in object
weight- measured amount of force of gravity
2. D.
3.Corn Syrup is on top, D=m/v
4. yes, the table is producing the same amount of force as the earth is pulling down on the book. Static Friction keeps it in place.
5.
1)(inertia)An object will stay a rest(not moving) unless acted upon by an unbalanced force.
B)A moving object will remain in motion unless acted upon ann unbalaced force.
ExA. Golf ball ain't gonna move less the club whacks it
ExB. A ball will roll down a hill forever if the force of friction didn't apply
2) Force = mass x acceleration.
Ex. a 30N truck moving at 13 mph has more force than a 20N car moving at 13mph.
3) for every action there is an equal opposite reaction.
Ex. Rocket exaust pushes with 5,000N and Earth Pushes back. Result rocket pushes of earth with 10,000 N
8. 500mph*
9.180mph*
*not considering earth rotation

Answer 5

As Lord Rutherford had it, "Physics is the only genuine technology, each little thing else is basically stamp-accumulating"... Physics explains each little thing (so a strategies as we are able to describe something as yet), mutually with chemistry & biology. examining physics will arm you with the capacity to make sensible guesses approximately basically approximately something that has a logical answer, so that's a surprising troubleshooting/situation-fixing device.

Answer 6

I wish I had 3 or 4 hands to play guitar REALLY well.

Answer 7

1.
mass = fundamental, year = derived, density = derived, weight = derived

2.
Wow, I got sick of taking this boring quiz already.