1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Whitepunk [10]
3 years ago
12

A car travels on a straight, level road. (a) Starting from rest, the car is going 38 ft/s (26 mi/h) at the end of 4.0 s. What is

the car's average acceleration in ft/s2? (b) In 3.0 more seconds, the car is going 76 ft/s (52 mi/h). What is the car's average acceleration for this time period?
Physics
1 answer:
lbvjy [14]3 years ago
8 0

Answer:

a)9.5\frac{ft}{s^2}\\ b) 12.66\frac{ft}{s^2}

Explanation:

A body has acceleration when there is a change in the velocity vector, either in magnitude or direction. In this case we only have a change in magnitude. The average acceleration represents the speed variation that takes place in a given time interval.

a)

a_{avg}=\frac{\Delta v}{\Delta t}\\a_{avg}=\frac{v_{f}-v_{i}}{t_{f}- t_{i}}\\a_{avg}=\frac{38\frac{ft}{s}-0}{4 s- 0}=9.5\frac{ft}{s^2}\\

b)

a_{avg}=\frac{\Delta v}{\Delta t}\\a_{avg}=\frac{v_{f}-v_{i}}{t_{f}- t_{i}}\\a_{avg}=\frac{76\frac{ft}{s}-38\frac{ft}{s}}{7 s- 4s}\\a_{avg}=\frac{38\frac{ft}{s}}{3s}=12.66\frac{ft}{s^2}

You might be interested in
What is pressure?
ladessa [460]
Pressure is defined as the force per unit area on a body.
8 0
3 years ago
Read 2 more answers
Imagine that a loudspeaker is producing a quiet tone with a low pitch. How will its vibrations change:
iVinArrow [24]
I believe it is A :) hope this helped
5 0
3 years ago
Winds are the main cause of ___ currents in the ocean
raketka [301]

Winds are the main cause of ocean currents in the ocean.

5 0
3 years ago
A vitamin called folic acid is very important for neural tube development, which is the development of the baby's
Anestetic [448]

Answer:

Explanation:

Folic acid is the form of folate found in vitamin supplements and fortified foods. Fortified foods, also called enriched foods, are foods that have specific nutrients added to them.

Neural tube defect happen when the tissues and bone around the brain and spine do not grow well. Neural tube can happen in the third and fourth week after conception (the first or second week after your first missed period). This could be before you know that you are pregnant.

Folic acid lowers the risk of your unborn baby having a neural tube defect . Neural tube are a group of serious birth defects that affect a baby’s spinal cord, brain and skull. Some babies with severe Neural tube defect birth are stillborn or do not survive long after birth. Spina Bifida is the most common Neural tube defect.

3 0
3 years ago
7. A type of non-renewable energy would be:<br> O wind<br> O petroleum<br> O water<br> solar
matrenka [14]

Answer:

petroleum

Explanation:

Petroleum is a gas that we use that just goes into the air whilst water can be recycled and purified, wind never ever goes away, and solar power can be converted into energy.

4 0
3 years ago
Other questions:
  • Magma can partially crystallize at depth and then rise to shallow depths where the remaining magma solidifies. the early-formed
    11·1 answer
  • At an age of 380,000 years, the temperature of the universe had fallen to 3000 K, and electrons could then combine with protons
    6·1 answer
  • Your class decides to build a circuit to make a light bulb shine. When you are finished, you have a setup with wires, a light bu
    7·2 answers
  • Two satellites are in circular orbits around a planet that has radius 9.00x10^6 m. One satellite has mass 53.0 kg , orbital radi
    15·1 answer
  • If you mix water that is 80° with the same amount of water that is 20° what will the resulting temperature be
    12·1 answer
  • A ball rolls at a speed of 6cm/s. How far does the ball roll in 40 seconds ? ____cm
    7·1 answer
  • What is a negative effect of increased carbon dioxide within the carbon cycle?
    10·1 answer
  • Gravitational notes of physics ​
    11·1 answer
  • Question 1 of 10
    8·1 answer
  • Fehling's solution is added to the counters of test tube b after about 3 minutes and it turns brick red.what food substance was
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!