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kow [346]
2 years ago
15

80 foot-pounds of work is needed to move the sofa in Tyler's apartment. Which of the following statements is true?

Physics
1 answer:
erastova [34]2 years ago
3 0
D is the correct answer
hop it helped.
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Which best describes how energy changes form in a car's engine?
andrezito [222]

Answer:

Multiple transformations occur because the chemical energy of the fuel is changed to several forms of energy

Explanation:

In a car engine, multiple energy transformation takes place. The chemical energy storef in fuel is transformed into mechanical energy which helps move the wheels of the vehicle.

The mechanical energy can also be transformed into electrical energy through a sort of dynamo system in vehicles. Stereo players use the electrical energy to produce sound.

We see that multiple energy conversions are common in a motor car.

6 0
2 years ago
Read 2 more answers
A stunt cyclist needs to make a calculation for an upcoming cycle jump. The cyclist is traveling 100 ft/sec toward an inclined r
Elena-2011 [213]

Answer:A=23.57^{\circ}

Explanation:

Given

velocity=100 ft/s

height of landing zone=10 ft

Equation of x(t)=100 t\cos (A)

y(t)=-16t^2+100t\sin (A)+10

Maximum height=35 feet

at maximum height

\frac{\mathrm{d} Y}{\mathrm{d} t}=0

\frac{\mathrm{d} x}{\mathrm{d} t}=-32t+100\sin A

t=3.125\sin A

At t=3.125\sin A

Y(t)=35=-16\times (3.125\sin A)^2+100\times 3.125\sin A\times \sin A+10

312.5\sin^2 A-156.25\sin^2 A=25

sin^2 A=0.16

A=23.57^{\circ}

8 0
2 years ago
If an electron is accelerated from rest through a potential difference of 9.9 kV, what is its resulting speed?
sweet [91]

Answer:

Speed of the electron will be v=5.896\times 10^7m/sec

Explanation:

We have given that charge on electron e=1.6\times 10^{-19}C

Mass of electron m=9.11\times 10^{-31}kg

Potential difference = V=9.9KV=9.9\times 10^3volt

Now according to energy conservation eV=\frac{1}{2}mv^2

1.6\times 10^{-19}\times 9.9\times 10^3=\frac{1}{2}\times 9.11\times 10^{-31}v^2

v=5.896\times 10^7m/sec

4 0
1 year ago
The three point charges +4.0 μC, -5.0 μC, and -9.0 μC are placed on the x-axis at the points x = 0 cm, x = 40 cm, and x = 120 cm
ale4655 [162]

Answer:

 

Explanation:

4μC will attract -9μC towards the centre and -5μC will repel it away from the centre.  Both these forces are opposite to each other.

Force due to 4μC on -9μC towards the centre

= k x Q₁ Q₂/R² = 9 X 10⁹ X 4 X 10⁻⁶ X 9 X 10⁻⁶ / (1.2)² = 225 X 10⁻³ N/C

Force due to -5μC on -9μC  away from the centre

= 9 x 10⁹ x 5 x 10⁻⁶x 9 x 10⁻⁶/( 0.8)² = 632.8 x 10⁻³ .N/C

Ner field =407.8 N/C.

6 0
2 years ago
Read 2 more answers
Sarah is 14 years old and skips school twice a week without any written explanation. What can she be charged with?
harina [27]

Answer:

Too many people are unaware or indifferent to that.” Fines can cost up to $500 per truancy, due within 30 days unless a judge gives an extension. For many students and families, it's another debt they can't pay. And if fines aren't paid, they can convert into an arrest warrant when a student turns 17.

Explanation:

5 0
2 years ago
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