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2 years ago

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The nutritional calorie (Calorie) is equivalent to 1 kilocalorie. One pound of body fat is equivalent to about 4.10 × 103 Calori

es. Express this quantity of energy in joules and kilojoules. Enter your answers in scientific notation.

1 answer:

FrozenT [24]2 years ago

6 0

Answer:

Explanation:

Using

4.01 × 10^3 * 4.186 = 1.72×10^4j

In KJ 17.2kj

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Let's examine over the next few questions an NFL kick as described in the 3rd Law video. The announcer claimed that the ball is

hichkok12 [17]

Answer:

8451.62109367671 Newtons

Explanation:

$1\ kg=1\times 9.8066500286389=9.8066500286389\ N$

$1 \lb=2.2046226218488\ kg$

It is known that

$1\ lbs=\dfrac{9.8066500286389}{2.2046226218488}=4.4482216282508\ N$

So,

$1900\ lbs=1900\times 4.4482216282508\\\Rightarrow 1900\ lbs=8451.6210936765\ N$

The force in Newtons is 8451.6210936765 Newtons

4 0

3 years ago

What is current of 12 ohm? help me pleasee

worty [1.4K]

1 Ampere

Explanation:

1/R = 1/8 + 1/10 + 1/12
1/R = (30 + 24 + 20) / 240
1/R = 74 / 240
R = 240 / 37
R = 120/37 Ohms
We know that,
V = IR
I = V/R
I = 12 / (120/37)
I = 12 × 37/120
I = 37/10
I = 3.7 A
Now,
The current in 12 ohm resistor →
= 1 A
∴ The current in 12 ohm resistor is 1 ampere

3 0

1 year ago

Plz help! ill give brainlyest to whoever gets this correct!

BARSIC [14]

What’s Brainlyest? Can you post a picture of the question or farther explain what (m>s) means?

3 0

2 years ago

A 14,700 N car is traveling at 25 m/s. The brakes are applied suddenly, and the car slides to a stop. The average braking force

Vlada [557]

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions here.

vo = 25 m/sec
<span>vf = 0 m/sec </span>
<span>Fμ = 7100 N (Force due to friction) </span>
<span>Fg = 14700 N </span>
<span>With the force due to gravity, you can find the mass of the car: </span>
<span>F = ma </span>
<span>14700 N = m (9.8 m/sec²) </span>
<span>m = 1500 kg </span>
<span>Now, we can use the equation again to find the deacceleration due to friction: </span>
<span>F = ma </span>
<span>7100 N = (1500 kg) a </span>
<span>a = 4.73333333333 m/sec² </span>
<span>And now, we can use a velocity formula to find the distance traveled: </span>
<span>vf² = vo² + 2a∆d </span>
<span>0 = (25 m/sec)² + 2 (-4.73333333333 m/sec²) ∆d </span>
<span>0 = 625 m²/sec² + (-9.466666666667 m/sec²) ∆d </span>
<span>-625 m²/sec² = (-9.466666666667 m/sec²) ∆d </span>
<span>∆d = 66.0211267605634 m </span>
<span>∆d = 66.02 m</span>

7 0

3 years ago

Standing at a crosswalk, you hear a frequency of 530 Hz from the siren of an approaching ambulance. After the ambulance passes,

malfutka [58]

Answer:

_s = 37.77 m / s

Explanation:

This is an exercise of the Doppler effect that the change in the frequency of the sound due to the relative speed of the source and the observer, in this case the observer is still and the source is the one that moves closer to the observer, for which relation that describes the process is

f ’= f₀ $\frac{v}{v - v_s}$

where d ’= 530 Make

when the ambulance passes away from the observer the relationship is

f ’’ = f₀ $\frac{v}{v + v_s}$

where d ’’ = 424 beam

let's write the two expressions

f ’ (v-v_s) = fo v

f ’’ (v + v_s) = fo v

let's solve the system, subtract the two equations

v (f ’- f’ ’) - v_s (f’ + f ’’) = 0

v_s = v $\frac{ f' - f''}{ f' + f''}$

the speed of sound is v = 340 m / s

let's calculate

v_s = 340 $(\frac{ 530 -424}{530+424} )$

v_s = 340 $(\frac{106}{954}$ )

v_s = 37.77 m / s

5 0

2 years ago