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Vera_Pavlovna [14]
3 years ago
5

In heavy rush-hour traffic you drive in a straight line at 12 m/s for 1.5 minutes, then you have to stop for 3.5 minutes, and fi

nally you drive at 15 m/s for another 2.5 minutes. (a) Plot the position-versus-time graph for this motion. your plot should extend from t=0 to t=7.5 minutes. (b) Use your plot from part (a) to calculate the average velocity between t=0 and t=7.5 minutes.

Physics
1 answer:
lara31 [8.8K]3 years ago
6 0

To develop this problem we will begin to determine the distances traveled in each of the segments using the linear motion kinematic equations. For this purpose, the distance traveled will be determined by the product between speed and time.

Part A is attached and indicates the graph of distance traveled vs time. And the calculations for development are found below. With the distance traveled and the total time it will be possible to find the average speed of the second part.

In 1.5 min the distance covered was,

d_1 = (1.5 min)(\frac{60s}{1min}) (12m/s) = 1080m

In the next 3.5min the distance covered is 0.

d_2 = 0

The distance covered for the next 2.5 min is

d_3 = (2.5 min)(\frac{60s}{1min})(15m/s)=2250m

Total distance covered is

d_T = d_1+d_2+d_3

d_T = 1080+0+2250

d_T = 3330m

For the average distance we need to use the total distance covered in the total time used. Then,

v_{Avg} = \frac{d_T}{t_T}

v_{Avg} = \frac{3330m}{7.5min (\frac{60s}{1min})}

v_{Avg} = 7.4m/s

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A rubber balloon is filled with 1 L of air at 1 atm and 300 K and is then put into a cryogenic refrigerator at 100 K. The rubber
Kipish [7]

Answer:

The correct answers are

(a) It decreases to 1/3 L

(ii) is (c) It is constant

Explanation:

to solve this, we list out the number of knowns and unknowns so as to determine the correct equation to solve the problem

The given variables are as follows

Initial volume V1 = 1L

V2 = Unknown

Initial Temperature T1 = 300K

let us assume that the balloon is perfectly elastic

At 300K the balloon is filled and it stretches to maintain 1 atmosphere

at 100K the content of the balloon cools reducing the excitement of the gas content which also reduces the pressure, however, the balloon being perfectly elastic, contracts to maintain the 1 atmospheric pressure, hence the answer to (ii) is (c) It is constant,

For (i) since we know that the pressure of the balloon is constant

by Charles Law V1/T1 =V2/T2

or V2 = (V1/T1)×T2 =\frac{1L}{300K}× 100K= \frac{1}{3} × L = L/3 hence the correct answer to (i) is 1/3L

8 0
3 years ago
In the parallel spring system, the springs are positioned so that the 37 N weight stretches each spring equally. The spring cons
Reptile [31]

Answer:

x = 5.29 m

Explanation:

given,

weight of stretch = 37 N

left-hand spring constant (k₁)= 2.7 N/cm

right hand spring constant(k₂)= 4.3 N/ cm

spring are connected in parallel

F = F₁ + F₂

F = k₁x + k₂x

F = (k₁+ k₂)x

37= (4.3+ 2.7)x

7 x = 37

x = 5.29 m

3 0
3 years ago
When the temperature of the air is 50°C, the velocity of a sound wave traveling through the air is approximately?
noname [10]

The answer is:

C. 361 m/s

The explanation:

To calculate  the speed of sound at a given temperature (50°C) we are going to use this formula:

v = 331 + 0.6T

when V is the velocity

and T is the temperature = 50°C

by substitution:

v = 331 + 0.6(50)

v = 361 m/s

So, The correct answer is C.

because of the variation of the motion of the molecules of air with change of temperature so, the velocity (V) of the  sound in the air is change with temperature.

5 0
3 years ago
Read 2 more answers
When you eat a candy bar, your body oxidizes glucose to get energy. where does this energy come from? kinetic energy of the gluc
babymother [125]
The correct answer is
<span>"chemical bonds within the glucose molecules "

The chemical bonds of the glucose molecules contain chemical energy, and when these bonds are broken by the processes acting inside the body, the energy of the bonds is released and it can be used by the body.


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8 0
3 years ago
How long will it take you to swim 100 meters if you swim at a speed of 12.5 m/s?
saul85 [17]

100 meters divided by a speed of 12.5 meters a second equals 8 seconds.

5 0
3 years ago
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