PHYSICS HIGH SCHOOL

If the distance around a circular track is 2.0km and if runners run 3 laps, what is the distance travelled?a) 2 km
b) 0km
c) 3 km
d) 6 km

Answers

Answer 1
Answer:

Answer:

d=6km

Explanation:

because multiply 2x3 is six

Related Questions

Which of the following is not an example of kinetic energy being converted to potential energy?
Assume it takes 7.00 minutes to fill a 30.0 gal gas tank. (a) Calculate the rate at which the tank is filled in gallons per second. (b) Determine the rate at which the tank is filled in cubic meters per second. (c) Determine the time interval, in hours, required to fill a 1.00 m^3 volume at the same rate. ( 1 US gal = 231 in.^3)
Which of the following occurs when light is reflected from a rough or unpolished surface? A. The original pattern of the light is distorted. B. The original pattern of the light is preserved. C. The angle of reflection is less than the angle of incidence. D. The angle of reflection is greater than the angle of incidence.
A ball is thrown directly downward with an initial speed of 8.00 m/s, from a height of 30.0 m. After what time interval does it strike the ground?
Solid Gas Liquid Fastest Speed drag and drop answer here Medium Speed drag and drop answer here Slowest Speed drag and drop answer here​

Which of the following is a true statement about objects in a vacuum?A. A feather will fall faster than a bowling ball.
B. A feather will fall slower than a bowling ball.
C. A feather and a bowling ball will fall at the same rate.
D. Both a feather and a bowling ball can't fall, but will always remain motionless.

Answers

C. A feather and a bowling ball will fall at the same rate. This is because there is no wind resistance and gravity pulls equally on both objects.
C. A feather and a bowling ball will fall at the same rate.

the jamaican bobsled team hit the brakes on their sled so that it decelerates at a uniform rate of 0.43 m/s, how long does it take to stop if it travels 85 m before coming to rest

Answers

 here's a cheap trick 
it would take the same time to accelerate from rest to top speed 
as it would take to decelerate from top speed to zero 
so 
instead of 
d = Vi t + 1/2 a t^2 where Vi is positive and a is negative 
we'll use 
Vi = 0 and a is positive 
giving 
85 = 0 + 1/2 (0.43) t^2 = 0.215 t^2 
t^2 = 395.345 
t = 19.88s or 20. s to 2 sig figs 

or we ccould find Vi from 
Vf*2 = Vi^2 + 2 a d 
0 = Vi^2 + 2 (0.43) 85 
Vi^2 = 71.4 
Vi = 8.45m/s 
then 
85 = 8.45 t + 1/2 (-0.43) t^2 
85 = 8.45 t - 0.215 t^2 
0.215 t^2 - 8.45 + 85 = 0 
t = 19.65s or 20. s to 2 s.f.(minor difference arises from rounding Vi) 
or another cheap trick 
when a is constant 
Vavg = (Vf + Vi) /2 = 8.45/2 = 4.225 
and 
d = Vavg t 
85 = 4.225 t 
t = 20.12 or 20. s to 2 s.f. (minor differences from intermidiate roundings) 

anyway you choose you get 20. s

As the speed of a fluid increases, ____.a. the pressure decreases
c. the force decreases
b. the pressure increases
d. the volume decreases

Answers

The correct answer for the question that is being presented above is this one: "a. the pressure decreases." As the speed of a fluid increases, the pressure decreases." The relationship of the speed and the pressure is inversely proportional. As the pressure increases, the speed decreases.

I think the answer is A.

What is the specific heat of an unknown substance if 2000 J of energy are required to raise the temperature of 4 grams of the substance 5 degrees Celsius?

Answers

The energy required to heat a substance is related by the formula:
Q = mCpΔT ; where Q is the energy, m is the mass of the substance, Cp is the specific heat capacity and ΔT is the change in temperature.
2000 = (4)(Cp)(5)
Cp = 100 Joules / g °C

Do compressional waves need a medium? If so which one would be the fastest ans slowest medium.

Answers

Yes, compression waves need a medium. without a medium there is nothing to compress, hence, no wave. A fast medium like a gas (air) is easy to compress and allows waves to move through it easily. a slow medium, like a liquid, is still pretty fast, but not as fast as air.

When a covalent or an ionic bond is formed a chemical change has occurred. Which of these is not associated with a chemical change?A) The atoms of the substance produced have been rearranged.
B) The substances produced are identical to the substances that reacted except that they're isomers.
C) The total mass of the reacting substances is the same as the total mass of the substance produced by the reaction.
D) The chemical properties of the substances produced by the reaction are different from those of the reacting substances.

Answers

Answer: B) The substances produced are identical to the substances that reacted except that they're isomers.

Explanation: Chemical change is a change in which atoms of the reactants are rearranged ,thus leading to formation of new products.

The new substances formed are different compounds from the original reactants and thus they have different properties.

2Na(s)+Cl_2(g)\rightarrow 2NaCl(s)

This is an example of chemical reaction in which the bond between chlorine molecule is broken and a new bond between sodium and chlorine gets formed.

NaCl formed is an ionic compound whereas chlorine is a covalent compound and sodium is a metal.
The answer is B). The total mass and the atom numbers of reacts and products are the same in the reaction. But that does not mean the production are identical to the reactants.
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Compare the charges and masses of protons, neutrons and electrons.