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Ber [7]
2 years ago
12

Plz help to answer the sheet above thanks

Physics
1 answer:
AysviL [449]2 years ago
6 0

Answer:

(B) sound/kinetic

(E) Gravitational/kinetic

(F) mechanical/sound

Explanation:

(B) the useful energy transfer is sound but a by product of that is kinetic or mechanical energy because of the vibrations needed to make sound

(E) the useful energy transfer is Gravitational potential but a by product of that is kinetic or mechanical energy

(F) the useful energy transfer is kinetic or mechanical energy but the byproduct is noise and occasionally heat

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A crane lifts a 425 kg steel beam vertically upward a distance of 614.4 m
Maru [420]

PHYSICS

*not sure about the answer but here we go*

Mass = 425 kg

distance = 614.4 m

acceleration = 1.8 m/s²

Answer :

Count Force first.

f \:  = m \:  \times a

F = 425 × 1,8

F = 765 N ✅

Now let's count Work.

w \:  =  \: f \:  \times s

W = 765 × 614.4

W = 470016 J ✅

7 0
2 years ago
A string of 18 identical holiday tree lights is connected inseries to a 190V source. The string dissipates 62.0 W. One of thebul
PtichkaEL [24]

Answer:

549.9 ohms, 65.65 watts, the power went up

Explanation:  power P = V²/R

v= 190volts , P =62watts

from P =V²/R

62=190²/R

making R the subject

R×62= 190²

62R =36100

R=36100/62

R=586.25 ohms

Resistance of each lamp = 586.26/18 =32.3ohms

a) resistance of the light string now = 17×32.3 = 549.9 ohms

b) P=V²/R

where R=549.9ohms , P=?

P=190²/549.9

P=36100/549.9

P=65.65watts

Power dissipated has increased( went up )

7 0
3 years ago
A car travels 554 miles south in 10.4 hours . what is the velocity of the car ? show all steps
kirill115 [55]

Answer:

<h3>The answer is 53.27 mi/hr</h3>

Explanation:

To find the velocity covered by the car we use the formula

v =  \frac{d}{t}  \\

where

d is the distance

t is the time

From the question

d = 554 miles

t = 10.4 hrs

We have

d =  \frac{554}{10.4}  \\  = 53.2692307...

We have the final answer as

<h3>53.27 mi/hr</h3>

Hope this helps you

4 0
3 years ago
I'm really tired so please help
Taya2010 [7]

So that the bridge doesn't break when the summer comes and It expands Or when winter comes and it contracts

3 0
3 years ago
When an external object’s frequency matches that of an adjacent object’s natural frequency, (blank) may occur.
dolphi86 [110]

Answer; Resonance is an increase in amplitude of a vibration that occurs when external vibrations match an object's natural frequency. The Tacoma Narrows Bridge may have collapsed because of resonance.

Explanation:

5 0
3 years ago
Read 2 more answers
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