All categories

3 years ago

Which of the following statements are true?

Physics

1 answer:

Likurg_2 [28]3 years ago

4 0

Answer:

Explanation:

(A) True: It is true.

In junction law, the current entering at a junction is equal to teh current leaving at the junction.

(B) False: It is false.

The kirchhoff's junction law is based on the conservation of charge.

Energy is used in the circuit.

(D) True: It is true.

It is based on the conservation of charge.

You might be interested in

Two two advantages and hazards of nuclear reaction.

Oksi-84 [34.3K]

Answer:

advantage : 1) produce no polluting gases .

2)doesn't contribute to global warming .

disadvantage: 1)waste is radioactive and safe disposal is very difficult and expensive.

2)local thermal pollution from east water affects marine life

4 0

4 years ago

Gravel is being dumped from a conveyor belt at a rate of 30 cubic feet per minute. It forms a pile in the shape of a right circu

Alona [7]

Answer:

dh/dt = 0.0566 feet / min

Explanation:

Volume per second, dV/dt = 30 cubic feet per minute

Diameter of cone = height of cone = h

at h = 15 feet, dh/dt = ?

Volume of cone is

V = πr²h

where, r be the radius of cone

According to question

radius of cone = half of diameter of cone = h /2

So,

$V=\pi \times \left ( \frac{h^{2}}{4} \right )\times h$

$V=\pi \times \frac{h^{3}}{4}$

Differentiate both sides with respect to h

$dV/dh = \frac{\pi }{4}\times 3h^{2}\times \frac{dh}{dt}$

by substituting the values

$30=\frac{3\times3.14}{4}\times 15\times 15\times \frac{dh}{dt}$

dh/dt = 0.0566 feet / min

7 0

4 years ago

Earth orbits once around the Sun about every 365 days. The Moon orbits around Earth. About how many days does it take the Moon t

PtichkaEL [24]

The answer is is 730.5 days rounded, so A. 730

3 0

3 years ago

Are waves created by vibration

dezoksy [38]

Answer: yes wave are created by vibration because if there anit any vibration then the water cant move

Explanation:

8 0

3 years ago

To practice tactics box 5.2 working with objects in contact. a 1200-kg car pushes a 2100-kg truck that has a dead battery to the

Reptile [31]

Mass of the car = 1200 kg

Mass of the truck = 2100 kg

Total mass of car and truck = 2100 + 1200 = 3300 kg

Since, the car pushes the truck. Hence, they will move together and will have same acceleration.

Let the acceleration be a.

According to Newton's second law:

F(net) = ma

F = 4500 N

4500 = 3300 × a

$a = \frac{4500}{3300}$

a = 1.36 m/s^2

Let the force applied by the car on truck be F.

F = F(net) on the truck

F = ma

F = 2100 × 1.36

F = 2856 N

Hence, the force applied by the car on the truck is 2856 N

6 0

3 years ago

Read 2 more answers