A physics problem that you won t be able to help with

1) Known: δt = 46-14 = 32 c water = water = 2l = cubic meter of water density = 1000kg cubic meter.

Find Q=? According to q = c * m * δt m = density * v q = cubic meter * cubic meter.

q=268800

2) It is known that p=1250w=t=2h

Find w=?According to w=pt

w=w=w=9000000j

You don't see the brothers above.

It is "60L".

This is a unit of volume, and mass is needed to calculate heat.

How to calculate if you don't change the unit.

this topic

q=cmδt w=pt

Just apply the formula

Cast iron propagation time t1 = l v iron.

Airborne transmission time t2 = l v gas.

then t2-t1=

i.e. l v gas - l v iron =

Substituting the data to solve the solution of v iron = 3908m s

So the speed of sound in cast iron should be 3908m s.

q suction = cm t =

Pay attention to the unity of units, as long as you remember the formula, it is easy to solve, this is the most straightforward calculation problem.

Upward pull force f= to the fourth power of the cow.

The downward gravity g = mg = 1500kg x 10 N, kg = 15000n resultant force, f = f-g = 24000n - 15000n = 9000n direction vertically upward.

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1 When all of them are here, the sound of the spring is stretched. In fact, you can also assume that the support force is directed towards the center of the circle

Suppose that the support force is directed to the center of the circle, then the answer to the solution should be a negative value!! In other words, the support force is outward.

Because the spring pulls it inward, the support force pushes it outward.

Because the elastic force of the point and the surface must be perpendicular to the contact surface, in this problem it is the vertical section, that is, the direction of the diameter.

The resultant effect of gravity and spring tension is to the left, and the direction of n must be to the right.

If you think about it this way, after reading the fg orthogonal decomposition, you will find that the resultant force points to the center of the circle, and since it is in equilibrium, n should be turned away from the center of the circle.

It's a math problem.

1) Solution: 2298 300 = seven and two-thirds) (h) Answer: It takes 7 hours and 40 minutes.

2) Solution: 20 60 = 1 3 (one-third) (h) 300 x 1 3 = 100 (km).

"It's a division.