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
prisoha [69]
3 years ago
10

The speed of a bus increases uniformly from 15 ms per second to 60 ms per second in 20 seconds. calculate 1. the average speed 2

. the acceleration 3. the distance travelled during the entire period
Physics
2 answers:
cluponka [151]3 years ago
7 0

Answer:

Part a)

v_{avg} = 37.5 m/s

Part b)

a = 2.25 m/s^2

Part c)

d = 750 m

Explanation:

Part a)

Since we know that bus is moving uniformly from initial speed of 15 m/s to 60 m/s in 20 seconds

So we will have

v_{avg} = \frac{d}{t}

we know that

d = \frac{v_f + v_i}{2} t

so we have

v_{avg} = \frac{v_f + v_i}{2}

v_{avg} = \frac{15 + 60}{2}

v_{avg} = 37.5 m/s

Part b)

As we know that acceleration is rate of change in velocity

so it is given as

a = \frac{v_f - v_i}{t}

a = \frac{60 - 15}{20}

a = 2.25 m/s^2

Part c)

distance moved by the bus is given as

d = v_{avg} \times t

d = 37.5 \times 20

d = 750 m

joja [24]3 years ago
3 0
Vf= 60m/s
vs = 15m/s
t=20s
a = vf-vs/t
a = 45m/s / 20s
a = 2,25 m/s²
S = vs *t + 1/2 a*t²
S = 15 m/s*20s +1/2 * 2,25m/s² * 400 s²
S = 300m +  450m
S = 750m
v average = 750m/20s
v average = 37,5 m/s
You might be interested in
40. The emotions of this drug vary from euphoria to detachment to panic.
statuscvo [17]

Answer:

Marijuana

Explanation:

User of marijuana.

6 0
2 years ago
Two spaceships leave Earth in opposite directions, each with a speed of 0.60c with respect to Earth. (a) What is the SPEED of sp
Studentka2010 [4]

Answer:

The relative speed of 1 relative to 2 is 0.88c

Explanation:

In relativistic mechanics the relative speed between 2 objects moving in different direction is given by

v_{ab}=\frac{v_{a}+v_{b}}{1+\frac{v_{a}v_{b}}{c^{2}}}

Since it is given that

v_{a}=0.6c\\\\v_{b}=0.6c

Applying values in the formula we get

v_{ab}=\frac{0.6c+0.6c}{1+\frac{(0.6c)^{2}}{c^{2}}}\\\\v_{ab}=0.88c

8 0
3 years ago
Which one of Newton's Laws fits this statement:
BabaBlast [244]

Answer:

First Law

Explanation:

I learned this in 6th grade

5 0
3 years ago
Illustrated here are three different __________ of carbon. They vary by the number of __________.
Elena L [17]

Your answer is D: isotopes; neutrons.

4 0
3 years ago
Read 2 more answers
Water flows on the inside of a steel pipe with an ID of 2.5 cm. The wall thickness is 2 mm, and the convection coefficient on th
Hatshy [7]

Answer:

U = 11.67 W/m² °C

Explanation:

Inner diameter, d = 2.5 cm = 0.025 m

Thickness of the wall, t = 2 mm = 0.002 m

thus, the outer diameter, D = d + 2t = 0.025 + 2 x 0.002 = 0.029 m

h_i =500 W/m^2.^oC

h_0 =12 W/m^2.^oC

Now, based on outside convection heat transfer

we have

\frac{1}{UA_o}=\frac{1}{h_iA_i}+\frac{1}{h_oA_o}

on rearranging, we get

\frac{1}{U}=\frac{1}{h_i}\frac{A_o}{A_i}+\frac{1}{h_o}

where, A_i\ \textup{and}\ A_o are the perimeter respective to inner and and outer diameter

on substituting the values, we get

\frac{1}{U}=\frac{1}{500}\frac{0.029^2}{0.025}+\frac{1}{12}

or

U = 11.67 W/m² °C

6 0
3 years ago
Other questions:
  • Which one is it ASAP
    12·1 answer
  • In 6 days, the temperature dropped 18 degrees. How many degrees per day did the temperature drop?
    10·1 answer
  • At a certain location, Earth has a magnetic field of 0.60 â 10â4 T, pointing 75° below the horizontal in a north-south plane. A
    10·1 answer
  • On a warm, balmy summer day you decide to relax by watching the latest building renovation in your neighborhood. You notice that
    13·1 answer
  • What is an example of velocity?
    7·1 answer
  • Please help solve this inelastic collision question please use GUESS to solve it if you can’t it’s fine
    14·1 answer
  • The current that charges a capacitor transfers energy that is stored in the capacitor’s electric field. Consider a 2.0 μF capaci
    11·1 answer
  • a farmer lifts a bale of hay that is 12m off the ground . If he uses a force of 350 n, how much work does the farmer do?
    10·1 answer
  • A 12.0 kg object is stationary on a surface that is inclined 30.0° relative to the horizontal. The coefficient of friction is 0.
    12·1 answer
  • Describe an instance where you might use standard rounding. Describe an instance where you might use order of magnitude estimati
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!