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
kramer
3 years ago
14

help me solve this: a bicyclist in the tour de france crests a mountain pass as he moves at 18 km/h. At the bottom, 4.0 km farth

er, his speed is 75 km/h. what was his average acceleration (in m/s square) while riding down the mountain?
Physics
1 answer:
Lana71 [14]3 years ago
7 0
First we have to convert:
75 km / h ( * 3.6 ) = 270 m/s
18 m/s = 64.8 m/s
d = v i · t + 1/2 a · t²
v = v i + a t
-----------------------------------
4000 = 64.8 · t + 1/2 a · t²
270 = 64.8 + a t
a = ( 270 - 64.8 ) / t
a = 205.2 / t
4000 = 64.8 t + 1/2 · ( 205.2 / t ) · t²
4000 = 64.8 t + 102.6 t
4000 = 167.4 t
t = 4000 : 167.4 = 23.89 s
a = 205.2 : 23.89 = 8.58 m/s²
Answer: His average acceleration was 8.58 m/s²

You might be interested in
Which of the following describes the relationship between the area of piston and the force exerted?
kondor19780726 [428]

Answer: Pascal’s principle (apex)

Hope this helps you out!

3 0
3 years ago
Read 2 more answers
A 20 kg box rests on the ground. Round all answers to the hundredths, if necessary. What is the weight of the box?​
cricket20 [7]
  • Mass=m=20kg
  • Acceleration due to gravity=10m/s^2

Weight=Applied force

\\ \sf\longmapsto F=mg

\\ \sf\longmapsto F=20(10)

\\ \sf\longmapsto F=200N

5 0
3 years ago
Read 2 more answers
Red Sox designated hitter, David Ortiz, swings at a 0.15 kg baseball and accelerates it at a rate of 3.0 • 10^4 m/s^2. How much
aivan3 [116]

Answer:

Explanation:

A lot.  That's why he was one of Boston's star hitters.

m = 0.15 kg

a = 3.0 * 10^4

F = ?

F = 0.15 * 3*10^4

F = 0.45 * 10^4

F = 4.5 * 10^3 Newtons

You should always express scientific notation as a number between 1 and 10 or 1 < x < 10. The power will determine the exact value of the number expressed as a scientific notation.

3 0
3 years ago
What is the velocity of an object that has a mass of 2.5 kilogram and a momentum of 1,000 kg·m/sec?
nadezda [96]
V =  p / m

V =  1000 / 2.5

V = 400 m/s

hope this helps!
7 0
3 years ago
What is storage of energy​
Talja [164]

Hey,

Storage of energy is known as potential energy. If you take a spring for example, and you stretch it then you hold it, it has the energy you put into it but it is potential since it's not moving. Of course once you let go of it its potential energy turns into kinetic energy.

There are other examples as well, such as a battery. I decided to use the spring example because it is simpler.

I hope it helped.

I wrote all that^.

3 0
3 years ago
Other questions:
  • Help! Elastic Collision.
    15·1 answer
  • The water level in a vertical glass tube 1.00 m long can be adjusted to any position in the tube. A tuning fork vibrating at 653
    15·1 answer
  • A force which resist the relative motion of two bodies in direct contact is called _______
    5·1 answer
  • The initial temperature of 150 g of ice is ????20°C. The spe- cific heat capacity of ice is 0.5 cal/g·C° and water’s is 1 cal/g·
    7·1 answer
  • What is meant by power of accommodation??​
    11·1 answer
  • . A chemistry student’s height is measured at 68.5 inches. How tall is the student in cm?
    15·2 answers
  • A car is driven east for a distance of 48 km, then north for 29 km, and then in a direction 30° east of north for 29 km. Determi
    8·1 answer
  • 1. When energy is transformed from one form to another it is called
    10·1 answer
  • In science class, students constructed an explanation on the composition of soil. Which student offered the BEST explanation? (A
    15·2 answers
  • A ball rolls horizontally off an incline, at velocity of 8.00m/s l. If the incline is 3.50m above the ground below determine:
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!