2 years ago

Question 18 (2 points)

Physics

1 answer:

fomenos2 years ago

4 0

Answer:

A.Moving electric charges (electrons in a circuit) creates a magnetic field and

a magnetic field can cause an electric charge to move (electricity).

Explanation:

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Q3. A large block of stone is held at a height of 15m having gained 4500J

xz_007 [3.2K]

Answer:

$gpe = mgh \\ = (mg)h$

(mg)= weight

$pe = (mg)h \\ 4500 = 15(mg) \\ mg = 300n$

mg = 300N

8 0

2 years ago

2 cycleists, 90 miles apart starting riding toward each other at some times one cycles twice as fast as the other if they meet 2

svetlana [45]

Average speed of the first car= 15 miles/hr

Average speed of the second car= 30 miles/hr

Explanations:

distance= d= 90 miles

Time= 2 hrs

let speed of first cyclist= v

speed of second cyclist= 2v

relative speed = v + 2v= 3v

using relative speed= Total distance/Total time

3v= 90/2

3 v=45

v=15 miles/hr

so speed of first cyclist= 15 miles/hr

speed of second cyclist= 2 (15)= 30 miles/hr

6 0

3 years ago

Two charged metallic spheres of radii, R = 10 cms and R2 = 20 cms are touching each other. If the charge on each sphere is +100

Molodets [167]

Answer:

$200\times 10^{-6}j$

Explanation:

We have given the radius of first sphere is 10 cm and radius of second sphere is 20 cm

So the potential of first sphere will be greater than the potential of the second sphere, so charge will flow from first sphere to second sphere

Let q charge is flow from first sphere to second sphere and then potential become same

So $V=\frac{K(100-q)}{r_1}=\frac{K\times 100}{r_2}$

200-100=2q+q

$q=\frac{100}{3}=33.33nC$

So $V=\frac{K(100-q)}{r_1}=\frac{9\times 10^{9}\times (100-33.33)\times 10^{-9}}{10\times 10^{-2}}=6003V$

We know that potential energy U=qV $=33.33\times 10^{-9}\times 6003=200\times 10^{-6}j$

8 0

2 years ago

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Steven buys a pair of scissors instead of getting a haircut. He belives the scissors will last for a long time, while the haircu

Shalnov [3]

Because it is something someone can be doing for him

6 0

2 years ago

A 75 kg refrigerator is located on the 70th floor of skyscraper (300 meters above ground). What is the potential energy of the r

Anna71 [15]

Answer:

220,500 Joules

Explanation:

PE = (75 kg) x (9.8 $m/s^{2}$ ) x (300 m)

PE = (735) x (300)

PE = 220,500 Joules

6 0

2 years ago

Read 2 more answers