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
GarryVolchara [31]
2 years ago
8

You drive a car for 2.0 h at 60 km/h, then for another 3.0 h at 85 km/h. What is your average velocity

Physics
1 answer:
Anon25 [30]2 years ago
8 0

Answer:

Explanation:

Average velocity is found in the total displacement experienced in the trip divided by the total time it took to make this trip. If, for the first 2.0 hours, the car travels at 60 km/hr, then in 2.0 hours the car can travel 120 km; if it then travels for 3.0 at 85 km/hr, it can travel 255 km in the same direction. The total time this took was 5.0 hours. So doing the math and rounding correctly by following the rules for the adding and subtracting of sig fig's:

v=\frac{120+255}{5.0}=\frac{380}{5.0}=76\frac{km}{hr}

If you do not round when you add, the average velocity is 75 km/hr

You might be interested in
Which of the following would increase​
bazaltina [42]

Answer:

1 and 3

Explanation:

<u>1 and 3  </u>

Increasing coils increases strength

   COOLING the wire would increase current flow and strength of magnet

Adding an iron core will definitely increase the strength of the electromagnet

7 0
1 year ago
Read 2 more answers
Which scenario involves kinetic energy transforming into potential energy? A. a book lying on a shelf B. a train traveling at a
NeX [460]
The answer is C.

The Kinetic energy which was exerted and experience pulling the string of a bow is kept as a potential energy at the end of the arrow in contact with the string. Once release from aim at stationary position the potential energy is again transformed.
6 0
3 years ago
If a lamp has a resistance of 50 ohms and is operated by a p.d. of 10V, find the current flowing through it
NemiM [27]
V=IR therefore I=V/R=10/50=0.2A therefore the current is 0.2 A
4 0
2 years ago
A bus is traveling with a uniform acceleration of 2.75 meters/second2. If the initial velocity of the bus is 16.5 meters/second,
Kaylis [27]
<span>The velocity will be 41.25 m/s2 after 9 seconds. To find velocity after a specific time period, multiply the acceleration (2.75) times the number of seconds (9) to receive 24.75 m/s, then add that to the initial velocity of 16.5 m/s. 24.75 + 16.5 = 41.25 m/s2.</span>
8 0
3 years ago
A driver of a car traveling at 14.6 m/s applies the brakes, causing a uniform deceleration of 1.2 m/s2. How long does it take th
vfiekz [6]

Recall that

v_f=v_0+at

It takes the car about 3.2 s to reduce its speed from 14.6 to 10.8 m/s, since

10.8\,\dfrac{\mathrm m}{\mathrm s}=14.6\,\dfrac{\mathrm m}{\mathrm s}+\left(-1.2\,\dfrac{\mathrm m}{\mathrm s^2}\right)t\implies t=3.2\,\mathrm s

Next, recall that

\Delta x=x_f-x_0=\dfrac{v_f+v_0}2t

Then the car undergoes a displacement of about 41 m, since

\Delta x=\dfrac{10.8\,\frac{\mathrm m}{\mathrm s}+14.6\,\frac{\mathrm m}{\mathrm s}}2(3.2\,\mathrm s)\implies\Delta x=41\,\mathrm m

6 0
3 years ago
Other questions:
  • Um elétron é lançado entre duas placas eletrizadas como mostra a figura. Sejam v= 6x10^6 m/s, ângulo 45°, E= 2x10^3 N/C, d= 3 cm
    7·1 answer
  • A circuit element maintains a constant resistance. If the current through the circuit element is doubled, what is the effect on
    8·1 answer
  • Cuál es el lugar de la humanidad en el universo?
    6·1 answer
  • Juno created a diagram to describe characteristics of freezing and deposition. Which labels belong in the areas marked X and Y?
    15·2 answers
  • A rogue wave is a random monstrous wave that occurs unexpectedly in the ocean.
    13·2 answers
  • What is the average velocity if the initial velocity of an object is 19 mph and the final velocity of 75 mph ?
    14·1 answer
  • If we could easily create machines or systems with no friction, what could we use them for?
    11·1 answer
  • Can anyone help please ​
    10·1 answer
  • which force field can accelerate an electron, but never change its speed? a) electric field b) magnetic field c) both of these d
    7·1 answer
  • 1. What type of waves can only travel through a medium?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!