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
AysviL [449]
3 years ago
15

Drivers a and b travel west from boston. driver a leaves three hours earlier traveling at a constant speed of 68mph. driver b fo

llows at a constant speed of 85 mph. how many hours would it take for driver b to catch up to driver a?
Physics
1 answer:
Elza [17]3 years ago
5 0

We can answer this using one of the equations of linear motion:

v = d / t

where:

v = velocity

d = distance

t = time

<span>In the problem, we are asked to find for the time in which Driver B will catch up to Driver A. Therefore,  find the time when dA = dB. Rearranging the equation and equation dA and dB will result in:</span>

<span>vA * tA = vB * tB  ---> 1</span>

It was given that:

vA = 68 mph

tA = tB + 3 (since person A was travelling 3 hours earlier)

vB = 85 mph

tB = unknown

Substituting into equation 1:

68 * (tB + 3) = 85 * tB

68 tB + 204 = 85 tB

tB = 12 hrs

Therefore driver B would catch up to driver A after 12 hrs.

 

 

<span> </span>

You might be interested in
Use the equation PiVi PfVf. Assume that Pi 101 kPa and Vi 10.0 L. If Pf 43.0 kPa, what is Vf
iren2701 [21]
Solving for vf gives you PiVi/Pf. Now plug in 101kPa*10L/43kPa = 23.48L. Using significant figures i would round to 23.5L
8 0
3 years ago
Where is a divergent boundary most likely to be found?
Alex787 [66]

Answer:

mid-ocean oceanic ridges

Explanation:

3 0
2 years ago
Read 2 more answers
The redshift of a star means that _____.
Gelneren [198K]
The correct answer is D. the star is getting farther away.

When the light has red-shifted, it shows that everything is moving away from a certain point. This is known as the Doppler effect and proves the Big Bang (which would be the center point that everything is moving away from). Just as a 'for your information', blue shift is when the star is moving towards us.

Hope I helped :)
4 0
3 years ago
Read 2 more answers
Ozone in the upper atmosphere absorbs energy in the 210-230 nmnm range of the spectrum. In what region of the electromagnetic sp
kifflom [539]

Answer:

Ultraviolet

Explanation:

The electromagnetic spectrum is divided into a number of parts. One of which is the ultraviolet region. The ultraviolet region is found between the 100 nm - 400 nm band of the electromagnetic spectrum. From the range we just stated now, we can see for certainty that the given range 210 nm - 230 nm lies inside of the 100 nm c 400 nm of the electromagnetic spectrum, that of which is the ultraviolet region.

5 0
3 years ago
A river flows down towards a lake along an incline. initially the river is 90 m above the lake flowing at a rate of 3 m/s. at th
lubasha [3.4K]

Total energy =kinetic energy +potential energy

Change in energy =change in (kinetic energy +potential energy)

potential energy, P.E=mgh

where m is the mass, g is acceleration due to gravity and h is the height.

potential energy per unit mass =gh

change in potential energy per unit mass = \Delta P.E.=g\Delta h

where, h is the height.

kinetic energy= K.E. =\frac{1}{2}mv^2

change in kinetic energy per unit mass,\Delta K.E. =\frac{1}{2}\Delta v^2

In the given question:

Height varies from 90 m to zero as river flows from 90 m height to lake at 0 m

Velocity varies from 3m/s at top to o m/s at bottom.

Therefore,

\Delta E =\Delta K.E.+\Delta P.E.\\ \Rightarrow \Delta E/m=\frac{1}{2}\Delta v^2+g\Delta h=\frac{1}{2}(0^2-3^2) m^2s^{-2}+9.8 (0-9)m^2s^{-2}=(-\frac{9}{2}-88.2)m^2s^{-2}=-92.7 m^2s^{-2}

Here, it was mentioned in the question internal energy of the water is constant and there is no change in the pressure at the inlet and outlet.

4 0
3 years ago
Other questions:
  • What are symptoms of Gomorrah
    10·1 answer
  • Red, green, and blue light rays each enter a drop of water from the same direction.Which light ray's path through the drop will
    11·1 answer
  • Which statement about dwarf planets is true?
    11·2 answers
  • What do astronomers mean by light pollution?
    6·1 answer
  • PLEASEEE HELP, thank you :)
    8·1 answer
  • An energy source forces a constant current of 2A to flow through a light bulbfilament for twenty seconds. If 4.6 kJ is given off
    8·1 answer
  • Three capacitors 2uf, 5uf and 7uf are connected in series what is their equivalent capacitance
    12·1 answer
  • Suppose a mad scientist went back in time to the beginning of the solar system and caused the newly formed Mars and Venus to swi
    6·1 answer
  • Explain
    8·1 answer
  • D. If they are dropped from their original heights at the same time, will the melon or
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!