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aalyn [17]
2 years ago
8

A roller coaster car rapidly picks up speed as it rolls down a slope. as it starts down the slope, its speed is 4 m/s. but 3 sec

onds later, at the bottom of the slope, its speed is 22 m/s. what is its average acceleration?
Physics
1 answer:
Arisa [49]2 years ago
8 0
Vi = 4 m/s
vf = 22 m/s
t = 3s
a = ?

vf = vi + a * t
vf - vi = a * t
a = (vf - vi) / t
a = (22 - 4) / 3
a = 6 m / s^2
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How much refrigerant must a system contain
Scrat [10]
About 10% to 15% of system charge
7 0
3 years ago
Calculate the difference in blood pressure between the feet and top of the head for a person who is 1.70 m tall.
cupoosta [38]

Answer:

P_2 - P_1 = 1.8 * 10^4\ Pa

Explanation:

Given

Height (h) = 1.70m

Required

Determine the difference in the blood pressure from feet to top

This is calculated using Pascal's second law.

The second law is represented as:

P_2 = P_1 + pgd

Subtract P1 from both sides

P_2 - P_1 = pgd

Where

p = blood\ density = 1.06 * 10^3kg/m^3

g = acceleration\ of\ gravity = 9.8N/kg

d =height = 1.70m

P2 - P1 = Blood Pressure Difference

So, the expression becomes:

P_2 - P_1 = 1.06 * 10^3 * 9.8 * 1.70

P_2 - P_1 = 17659.6Pa

P_2 - P_1 = 1.8 * 10^4\ Pa

Hence, the difference in blood pressure is approximately 1.8 * 10^4\ Pa

3 0
3 years ago
Use the claim to answer the question.
Pachacha [2.7K]

Scientific evidence such as reflection and photoelectric effect has proven the wave-particle model of electromagnetic radiation to be true.

<h3>What is electromagnet radiation?</h3>

Electromagnetic radiation is radiation produced as a result of the interactions of the electric and magnetic fields.

Some forms of electromagnetic radiation include:

  • radio waves
  • microwaves
  • ultraviolet radiation
  • visible light

Electromagnetic radiation can be described using a wave model or a particle model.

The wave property of electromagnetic radiation include:

  • diffraction
  • reflection
  • refraction

The particle property of electromagnetic radiation include:

  • photoelectric effect
  • Compton effect.

Therefore, the wave-particle model of electromagnetic radiation is correct because it can be backed up by experiments and evidence.

Learn more about wave-particle model at: brainly.com/question/20452331

6 0
1 year ago
Read 2 more answers
PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!!
zhannawk [14.2K]
<h3>Answer;</h3>

A- Potential energy

B-  Kinetic energy

C- Potential energy

D - Both potential energy and kinetic energy

E- Both potential and kinetic energy

Potential energy is the energy possessed by the body while at rest. It is calculated by the formula mgh, where m is the mass of the body and h is the height, and g is the gravitational acceleration.

Kinetic energy on the other hand is the energy possessed by the body while in motion. It is calculated by the formula 1/2mv², where m is the mass and v is the velocity of the object or body in motion.

5 0
3 years ago
An experiment means?
anastassius [24]

Answer:

a scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact.

Explanation:

i don't have one

3 0
3 years ago
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