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vekshin1
3 years ago
7

Question 4 A car of mass 820 kg has a maximum power of 30 kW and moves against a constant resistance of motion to 910 N. Calcula

te the maximum speed of the car in the following situation; b)Up an incline (hill) of 8.75° to the horizontal?​
Physics
1 answer:
wolverine [178]3 years ago
7 0

Answer:

P = W / t = m g s / t = m g v       where work by auto = m g s

30 kw = 30000 watts = 30000 J / s

Work wasted = F v       as shown above relating work and power

Work done against incline = m g s sin 8.75  and power against incline

= m g v sin 8.75 = 1222 v Joules / sec

power in moving auto = power available - power lost to friction

power in moving auto = 30000 - resistance = 30000 - 910 v

1222 v = 30000 - 910 v

v = 30000 / 2132 = 14 m/s

Note: constant resistance to motion must mean P = W / t = F s / t = F v

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Answer:

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Explanation:

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3 years ago
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The dimensions of a room are 16.40 m long, 4.5 m wide and 3.26 m high. What is the volume of the room in cubic meters? Express y
gtnhenbr [62]

Answer:

V=2.4\times 10^2\ \text{m}^3

Explanation:

Given that,

The dimensions of a room are 16.40 m long, 4.5 m wide and 3.26 m high.

We need to find the volume of the room.

The room in the shape of cuboid whose volume is given by :

V=L\times B\times H

L,B,H are length, breadth and height of the room

So,

V=16.4\times 4.5\times 3.26\\\\V=240.588\ \text{m}^3\\\\\text{In scientific notation}\\\\V=2.4\times 10^2\ \text{m}^3

Hence, the volume of the room is 2.4\times 10^2\ \text{m}^3

5 0
3 years ago
2. A 5 year old child pushes with a force of 5 N to get a sumo wrestler to move, but the
Svetllana [295]

formula= W=f*d

w=work done

f=force

d=distance

w=f*d

w= 5n*0(does not budge)means does not move so distance is zero

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6 0
3 years ago
A) Using Excel, or some other graphing software, plot the values of y as a function of x. (You will not submit this spreadsheet.
tiny-mole [99]

Answer:

   y = 1.06 x + 0.14

            r² = 0.95

Explanation:

a) To make this graph, a spreadsheet-type calculation program is used, see attached.

On the y axis are the measured values

On the x-axis, the values ​​checked in the experiment are placed.

From the graph we see that a linear graph and that one of the values ​​has a strong deviation with respect to the others

b) The red line is the best straight line that can be drawn,

    for this the quality ajust is r²  

the closer to 1 the better the fit

           

the equation of the line is

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            r² = 0.95

3 0
3 years ago
A 10.0 N package of whole wheat flour is suddenly placed on the pan of a scale such as you find in grocery stores. The pan is su
inna [77]

Answer:

0.025 m

Explanation:

From the question,

Applying Hook's law

F = ke................... Equation 1

Where F = Force, k = spring constant of the scale, e = maximum distance at which the spring will compress.

make e the subject of the equation

e = F/k....................... Equation 2

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Substitute these values into equation 2

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7 0
3 years ago
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