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3 years ago

HELP ASAP PLEASE PHYSICS

Physics

2 answers:

LiRa [457]3 years ago

6 0

Answer:

1. 45.65

2. 1.19x10^19

3. 514OHM

4. 2.45 ( NOT 1.86 OR 1.36)

6. 20.06A

7. 206 ohms

8. 13 Ohms

9. 2 ohms

10. 0.051 ( NOT 0.036 OR 0.089)

Explanation:

I've struggled with both problems 4 and 10

Nataly_w [17]3 years ago

5 0

Answer: did you get the answers?

Explanation:

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A bowling ball traveling with constant speed hits the pins at the end of a bowling lane 16.5 m long. The bowler hears the sound

pshichka [43]

Let , speed of bowling ball is v .

Time taken by ball to hit the pins , $t=\dfrac{16.5}{v}$ .

Speed of sound , u = 343 m/s .

Time taken by sound to reach ear , $T=\dfrac{16.5}{343}=0.048\ s$ .

Now ,

Time taken by sound to hear after release :

$2.79=\dfrac{16.5}{V}+0.048\\\\2.79-0.048=\dfrac{16.5}{V}\\\\2.742=\dfrac{16.5}{V}\\\\V=\dfrac{16.5}{2.742}\\\\V=6.02\ m/s$

Hence , this is the required solution .

4 0

3 years ago

A box sits on the back of a flatbed truck. If the coefficient of static friction between the box and the truck bed is μs = 0.400

slava [35]

Answer:

28,699m

Explanation:

The force to make the box move should be <u>μs.N=μs.m.g=m.</u><u>|</u><u>a</u><u>|</u>

then,

|a|=μs.g

Being

μs coefficient of static friction,

N the force made by the truck on the box caused by the gravity force,

m the mass,

g the acceleration of gravity

and a the acceleration of the truck.

$x = v \times t + \frac{1}{2} \times a \times {t}^{2}$

as the truck is stopping, the acceleration is negative. then,

$x = v \times t - \frac{1}{2} \times |a| \times {t}^{2}$

$|a| = v \div t \\ t = v \div |a|$

$x = v \times (v \div |a| ) - \frac{1}{2} \times |a| \times {(v \div |a|)}^{2}$

$x = v \times (v \div μs.g ) - \frac{1}{2} \times |a| \times {(v \div μs.g)}^{2}$

$x = \frac{{v}^{2}}{μs \times g} - \frac{1}{2} \times \frac{{v}^{2}}{μs \times g} \\ x = \frac{1}{2} \times \frac{{v}^{2}}{μs \times g} \\ x = 0.5 \times \frac{{(15m/s) }^{2} }{0.4 \times 9.8m/ {s}^{2} } = 28.699m$

28,699m

7 0

3 years ago

Which statement does NOT explain the concept of the Doppler Effect? A. As an observer moves away from a stationary sound, the so

Nookie1986 [14]

Answer:

Explanation:

When the sound is moving away from the stationary object the pitch decreases according to the Doppler Effect.

4 0

3 years ago

What is the kinetic energy of a 150 kg object that is moving at a speed of 15 m/s?

Oksanka [162]

It's 16,875

Hope I helped! ( Smiles )

4 0

3 years ago

Using the equation for decay, calculate the amount left of a radioactive sample amount N0 if the decay constant is 0.00125 secon

makkiz [27]

The amount left of a radioactive sample amount N0 if the decay constant is 0.00125 seconds and the time is 180 seconds is 0.7999 N.

The time it takes for half of the original population of radioactive atoms to decay is called the half-life. The relationship between the half-life T1/2 and the decay constant is given by T1/2 = 0.693/λ.

N=N0e−λt
given λ = 0.00125 seconds
t = 180 seconds
Now putting values.
N=N0e−λt = 0.799
N= 0.7999.