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
Westkost [7]
3 years ago
13

a driver travels 135 km, east in 1.5 h, stops for 45 minutes for lunch, and then resumes driving for the next 2.0 h through a di

splacement of 215 km, east. what is the driver’s average velocity?
Physics
1 answer:
daser333 [38]3 years ago
7 0

Answer:

v = 98.75 km/h

Explanation:

Given,

The distance driver travels towards the east, d₁ = 135 km

The time period of the travel, t₁ = 1.5 h

The halting time, tₓ = 46 minutes

The distance driver travels towards the east, d₂ = 215 km

The time period of the travel, t₁ = 2 h

The average speed of the vehicle before stopping

                                    v₁ = d₁/t₁

                                        = 135/1.5

                                       = 90 km/h

The average speed of vehicle after stopping

                                    v₂ = d₂/t₂

                                         = 215/2

                                        = 107.5 km/h

The total average velocity of the driver

                                      v = (v₁ +v₂) /2

                                         = (90 + 107.5)/2

                                         = 98.75 km/h

Hence, the average velocity of the driver, v = 98.75 km/h

You might be interested in
A mass accelerates uniformly when the resultant force on it is?
Elis [28]
. . . . . not zero .


Note:  "... unbalanced" would be a terrible answer.
5 0
3 years ago
the electrical resistance of copper wire varies directly with its length and inversely with the square of the diameter of the wi
leonid [27]

Answer:24.47

Explanation:

Given

L_1=30 m

d_1=3 mm

R_1=25 \Omega

L_2=40 m

d_2=3.5 mm

we know Resistance R=\frac{\rho L}{A}

Where R=resistance

\rho =resistivity

L=Length

A=area of cross-section

A=\frac{\pi d^2}{4}

Thus R\propto \frac{L}{d^2}

therefore

R_1\propto \frac{L_1}{d_1^2}--------1

R_2\propto \frac{L_2}{d_2^2}--------2

divide 1 and 2 we get

\frac{R_1}{R_2}=\frac{L_1}{L_2}\times \frac{d_2^2}{d_1^2}

\frac{R_1}{R_2}=\frac{30}{40}\times \frac{3.5^2}{3^2}

R_2=25\times 0.734\times 1.33

R_2=24.47 \Omega

8 0
3 years ago
What best describes the states of nonmetals when they are at room temperature? Most nonmetals are gaseous, but some are liquid o
abruzzese [7]
I think the correct answer from the choices listed above is the first option. The statement that best describes the state of metals when they are at room temperature would be that most <span>nonmetals are gaseous, but some are liquid or solid. Hope this answers the question. Have a nice day.</span>
3 0
3 years ago
Read 2 more answers
A ball has a kinetic energy of 106 J. If the ball is moving at a velocity of 2.01 m/s, what is the mass of the ball, in kilogram
dem82 [27]

Answer:

Explanation:

KE= ½mv²

m = 2KE/v²

m = 2(106)/2.01²

m = 52.47394...

m = 52.5 kg

4 0
2 years ago
Calculate the increase in potential energy of a 60.0-kg man who climbs a ladder 10.0 meters high
andriy [413]

Potential energy = (mass) · (gravity) · (height)

PE = (60 kg) · (9.8 m/s²) · (10 m)

PE = (60 · 9.8 · 10) · (kg · m²/s² )

PE = 5,880 joules

4 0
3 years ago
Other questions:
  • What is the basic unit of each type of elements
    14·1 answer
  • During a demonstration of the gravitational force on falling objects to her class, Sarah drops an 11 lb. bowling ball from the t
    8·2 answers
  • What is the density of a rock that has a mass of 10 grams and the volume of 2ml?
    10·1 answer
  • What is the pathway of sound through fluids starting at the oval window through to dissipation of the sound waves at the round w
    7·1 answer
  • An electron moves in the plane of this screen toward the top of the screen. A magnetic field is also in the plane of the screen
    8·1 answer
  • The picture below shows four objects a paper clip, a pair of scissors, a needle and a horseshoe. assume that each object is made
    13·1 answer
  • On a frictionless horizontal air table, puck A (with mass 0.254 kg ) is moving toward puck B (with mass 0.367 kg ), which is ini
    15·1 answer
  • You can use _______________ to change a liquid into a gas.
    15·1 answer
  • The frequency of sound is 200 Hz. What does it mean? Please help me​
    12·1 answer
  • HELP MY GRADES-
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!