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
Naddik [55]
3 years ago
5

A commuting student leaves home and drives to school at an average speed of 39.0 km/h. After 23.0 min he realizes that he has fo

rgotten his homework and returns home to get it at the same average speed. It takes 10.0 min to find the report, after which the trip to school 39.0 km away to the east is resumed at the same speed as before. What is the average speed for the entire trip ? What is the average velocity for the entire trip?
Physics
1 answer:
Ilia_Sergeevich [38]3 years ago
8 0

Answer:s_{avg}=\frac{117}{\frac{213}{60}}=32.95 km/h

v_{avg}=\frac{39}{\frac{213}{60}}=10.98 km/h

Explanation:

Given

Distance between home and school is 39 km

Total time taken =\frac{39}{39}+\frac{23}{60}+\frac{39}{39}+\frac{10}{60}+\frac{39}{39}

i.e.

t=3\times 60+23+10=213 min

Total Distance traveled =39+39+39=117 km

displacement=39 km

Thus Average speed =\frac{Distance}{Time\ taken}

s_{avg}=\frac{117}{\frac{213}{60}}=32.95 km/h

Average velocity=\frac{Displacemet}{Time\ taken}

v_{avg}=\frac{39\times 60}{213}=10.98 km/h

You might be interested in
Why is deforestation a serious global environment problem
julia-pushkina [17]

Answer:

we all know that deforestation is when tress are cut down but this may cause cardio dioxide to go up into the atmosphere and this may cause the rise in sea level and temperates tend to fluctuate

Explanation:

I'm just that smart yah dig

5 0
3 years ago
A vertically hung spring has a spring constant of 150. newtons per meter. A
stiks02 [169]
What fraction of stipend triangle is a shaded triangle? What fraction of the spotted triangle is a shaded triangle? Use >,
5 0
3 years ago
A 1,200 kg dragster, starting from rest, reaches a maximum velocity of 140m/s in 5 seconds. At the 5 second mark, the dragster d
SSSSS [86.1K]

Answer:

Drag or air resistance

Explanation:

The force of friction caused by a moving fluid is called drag.  When that fluid is air, it's also known as air resistance.

8 0
3 years ago
Water can dissolve almost anything in the universe
Elodia [21]

Answer:

No, its not possible for water to dissolve almost anything in the universe.

Explanation:

Solubility of a solute defines the ability of that solute to dissolve in a given solvent. It is defined as the maximum amount of solute dissolved in a solvent at equilibrium. The solution which results from dissolving this maximum amount is called a saturated solution, and one it has been reached, no more solute can be dissolved in it.

Different substances in the universe have diffferent solubilities in water, some very high (soluble) (eg. sugar and salt) and some very low (insoluble) (eg plastics). The substances that are able to form bonds with water (Hydrogen or Ionic) are more soluble than those who are not able to do so.

5 0
3 years ago
An archer puts a 0.30-kg arrow to the bowstring. An average force of 201 N is exerted to draw the string back 1.3 m. Assuming th
vovikov84 [41]

Answer:

41.74 m/s

Explanation:

The energy used to draw the bowstring = the kinetic energy of the arrow.

Fd = 1/2mv²................................ Equation 1

Where F = force, d = distance move string, m = mass of the arrow, v = speed of the arrow.

make v the subject of the equation

v = √(2Fd/m)...................... Equation 2

Given: F = 201 N, m = 0.3 kg, d = 1.3 m.

Substitute into equation 2

v = √(2×201×1.3/0.3)

v = √(1742)

v = 41.74 m/s.

Hence the arrow leave the bow with a speed of 41.74 m/s

3 0
3 years ago
Read 2 more answers
Other questions:
  • A disturbance sends ripples across water in a tub.
    5·2 answers
  • A single-phase transformer has a turns ratio of 20,000/5,000. If a DC voltage of 50 V is applied to the primary winding, what wi
    10·1 answer
  • What type of circuit has all its resistors in the same path?
    6·2 answers
  • 30 POINTS PLZ HELP!!!
    9·2 answers
  • List one way to take advantage of creating even more kinetic energy on this particular technologically advanced field
    14·1 answer
  • List two things you should not do when encountering a funeral procession?
    12·1 answer
  • Dois automóveis A e B percorreram uma trajetória retilínea conforme as equações horárias Sa = 30 + 20t e Sb = 90 – 10t, sendo a
    10·1 answer
  • A state trooper is traveling down the interstate at 20 m/s. He sees a speeder traveling at 50 m/s approaching from behind. At th
    13·1 answer
  • even though the sun is so much bigger than the moon, why does the moon have a stronger effect on tides?
    15·1 answer
  • 3. What is mechanical advantages and velocity ratio of a machine?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!