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
Paraphin [41]
3 years ago
15

A person takes a trip, driving with a constant speed of 89.5km/h, except for a 22.0−min rest stop. If the person's average speed

is 77.8km/h
, how much time is spent on the trip and how far does the person travel?
Average Speed:

Let a body covered d1,d2,d3
distances in respective time intervals t1,t2 and t3.

.

Then the average speed of the body is given by

Average Speed=Total DistanceTotal Time=d1+d2+d3t1+t2+t3.
Physics
1 answer:
Elanso [62]3 years ago
8 0

Answer:

stop using brainly and learn this bs in class

Explanation:

You might be interested in
Why plate tectonics is a scientific theory and not a scientific law.
ser-zykov [4K]

Answer:

We have not drilled to the center of the earth.

Explanation:

7 0
3 years ago
Which of the following speeds is greatest? (2.54 cm = 1.00 in.)
Mama L [17]

Answer:

Hi, There!

O 10 m/s

O 10 yd/s

------------------------------------------------------------------------------------------------------------------

Have a great day!

7 0
3 years ago
What evidence do we have that Earth has a magnetic field surrounding the planet?
Ber [7]
A compass works the way it does because Earth has a magnetic field that looks a lot like the one in a magnet. The Earth's field is completely invisible, but it can be felt by a compass needle on the Earth's surface, and it reaches thousands of miles out into space.
5 0
3 years ago
Read 2 more answers
A hollow cylinder of mass 2.00 kgkg, inner radius 0.100 mm, and outer radius 0.200 mm is free to rotate without friction around
kipiarov [429]

Answer: 2.86 m

Explanation:

To solve this question, we will use the law of conservation of kinetic and potential energy, which is given by the equation,

ΔPE(i) + ΔKE(i) = ΔPE(f) + ΔKE(f)

In this question, it is safe to say there is no kinetic energy in the initial state, and neither is there potential energy in the end, so we have

mgh + 0 = 0 + KE(f)

To calculate the final kinetic energy, we must consider the energy contributed by the Inertia, so that we then have

mgh = 1/2mv² + 1/2Iw²

To get the inertia of the bodies, we use the formula

I = [m(R1² + R2²) / 2]

I = [2(0.2² + 0.1²) / 2]

I = 0.04 + 0.01

I = 0.05 kgm²

Also, the angular velocity is given by

w = v / R2

w = 4 / (1/5)

w = 20 rad/s

If we then substitute these values in the equation we have,

0.5 * 9.8 * h = (1/2 * 0.5 * 4²) + (1/2 * 0.05 * 20²)

4.9h = 4 + 10

4.9h = 14

h = 14 / 4.9

h = 2.86 m

8 0
2 years ago
Read 2 more answers
A balloon contains 2.3 mol of helium at 1.0 atm , initially at 240 ∘C. What's the initial volume? What's the volume after the ga
pashok25 [27]
A) initial volume
We can calculate the initial volume of the gas by using the ideal gas law:
p_i V_i = nRT_i
where
p_i=1.0 atm=1.01 \cdot 10^5 Pa is the initial pressure of the gas
V_i is the initial volume of the gas
n=2.3 mol is the number of moles
R=8.31 J/K mol is the gas constant
T_i=240^{\circ}C=513 K is the initial temperature of the gas

By re-arranging this equation, we can find V_i:
V_i =  \frac{nRT_i}{p_i} = \frac{(2.3 mol)(8.31 J/mol K)(513 K)}{1.01 \cdot 10^5 Pa}=0.097 m^3

2) Now the gas cools down to a temperature of
T_f = 14^{\circ}C=287 K
while the pressure is kept constant: p_f = p_i = 1.01 \cdot 10^5 Pa, so we can use again the ideal gas law to find the new volume of the gas
V_f =  \frac{nRT_f}{p_f}= \frac{(2.3 mol)(8.31 J/molK)(287 K)}{1.01 \cdot 10^5 Pa} = 0.054 m^3

3) In a process at constant pressure, the work done by the gas is equal to the product between the pressure and the difference of volume:
W=p \Delta V= p(V_f -V_i)
by using the data we found at point 1) and 2), we find
W=p(V_f -V_i)=(1.01 \cdot 10^5 Pa)(0.054 m^3-0.097 m^3)=-4343 J
where the negative sign means the work is done by the surrounding on the gas.
5 0
3 years ago
Other questions:
  • A car of mass 1200 kg traveling westward at 30. m/s is slowed to a stop in a distance of 50. m by the car’s brakes. What was the
    9·2 answers
  • What test were used to find out information about the iceman
    11·1 answer
  • What are 2 different ways you can improve your endurance, muscular strength, flexibility, and body composition before your next
    5·1 answer
  • Apr 22, 1:11:18 PM
    8·2 answers
  • Se tiene una esfera de 100g, ¿Qué espacio ocupa?<br><br> La necesito, por favor!!!
    12·1 answer
  • An example of hydro energy is
    10·1 answer
  • A ray of light travels from a glass-to-liquid interface at an angle of 35.0º. Indices of refraction for the glass and liquid are
    5·1 answer
  • 1. why does the sun have the greatest amount of gravity in our solar system?
    11·2 answers
  • One light beam has wavelength, λ1, and frequency, f1. Another light beam has wavelength, λ2, and
    8·1 answer
  • Consider a locomotive and the rest of a freight train to be a single object. Suppose the locomotive is pulling the train up a hi
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!