A 10-kilogram bicycle is traveling at a speed of 2 m/s. what is the bikes kinetic energy?

Answers

Answer 1

Answer: We have: K.E. = 1/2 mv²
Here: m = 10 Kg
v = 2 m/s

Substitute their values,
K.E. = 1/2 * 10 * 2²
K.E. = 1/2 * 10 * 4
K.E. = 20 J

In short, Your Answer would be 20 Joules

Hope this helps!

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A tank with a flat bottom is filled with water to a height of 4 meters. What is the pressure at any point at the bottom of the tank? (You can ignore atmospheric pressure when calculating your answer.)A. 18.9 kPa
B. 9.8 kPa
C.39.2 kPa
D. 4.0 kPa

Answers

Answer

C.39.2 kPa

Explanation

The pressure in liquids depend on the depth or what we call the liquid column(h), the density of the liquid(σ) and the the acceleration due to gravity(g).

h = 4.00 m

σ = 1000 Kg/m³

g = 9.8m/s²

Pressure Is given by;

P = σgh

= 1000 × 9.8 × 4

= 39200 Pa

=39.2 KPa

P=pgh, remeber that g=9.8 , so ignoring the atmosheric pressure youwould just multiply 9.8x4 and you would get 39.2KPa

The doppler effect is the change in observed frequency due toa. the type of medium the wave is in
b. the type of wave
c. the original frequency of the source
d. the motion of the source or observer

Answers

d. the motion of the source or observer

I believe the answer is D, im not 100% sure though.

Driving home from school one day, you spot a ball rolling out into the street (Figure 5-21). You brake for 1.20 s, slowing your 950-kg car from 16.0 m/s to 9.50 m/s.a) What was the average force exerted on your car during braking?
b) How far did you travel while braking?

Answers

a ) v = v o + a t ( the acceleration will be negative )
9.50 = 16.0 + a * 1.2
a * 1.2 = -16.0 + 9.50
a * 1.2 = - 6.5
a = - 6.5 : 1.2
a = - 5.4167 m/s²
F = m * a = 950 kg * 5.4167 m/s²
F = 5,145.8 N ( the average force exerted on a car during braking )
b ) d = v o - a t² / 2
d = 16.0 * 1.2 - ( 5.4167 * 1.2² / 2 ) =
= 19.20 - 3.90 = 15.30 m

A(n) _____ is the smallest complete part of a compound.A. ion
B. atom
C. element
D. molecule

Answers

The answer to this is: a molecule

A molecule is the smallest complete part of a compound. I think the answer is D. Molecule

The wavelength of a given region of the electromagnetic spectrum ranges from 1 x 10-11 - 1 x 10-8 meters. Which waves are found in this region?A) gamma rays

B) x-rays

C) micro waves

D) radio waves

Answers

Answer: X-rays

The range of X-rays goes from 1x10^-8 to 1x10^-11.

Which of the following is most closely related to the specific heat of a substance?a. its temperature
b. its melting point
c. its amount of heat transferred
d. its rate of change in temperature

Answers

The following that is is most closely related to the specific heat of a substance is its rate of change in temperature. The answer is letter D. The amount of energy required to raise the temperature of 1 kilogram of a substance by 1 Kelvin is called the specific heat. The answer is a. For example, water. Water has a specific heat of 4.18 Joules per kilogram per Kelvin. This means that in order for water to change from one state to the other at one kelvin, it needs 4.18 Joules of energy per one kilogram of water. But it does not apply to changes in phase, because the heat added or removed during a phase change does not change the temperature of a substance.

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What does viscosity describe? Question 4 options: A. a fluid's resistance to being heated B. the rate of evaporation of a fluid C. how much energy it takes to warm a fluid D. the density of a fluid E. a fluid's resistance to flowing