4 years ago

What is a discussion?

2 answers:

7 0

Answer:

um, when you talk with other people about stuff. (I'm not trying to sound like a smarta s s I'm just giving a definition...)

Explanation:

sergey [27]4 years ago

7 0

The action or process of talking about something in order to reach a decision or to exchange ideas.

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A basketball was thrown and reached a velocity of 3 m/s in 0.5 seconds. What was the acceleration of the basketball?

Alborosie

Answer: acceleration is 6 m/s²

Explanation: V = vo + at. If initial speed Is zero,

V = at and a= V/t = 3m/s /0.5 s

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3 years ago

A power station burns 75 kilograms of coal per second. Each kg of coal contains 27 million joules of energy.

olasank [31]

A) $P = 75 \times (2.7\times10^7) = 2.025\times10^9 W$

b) $Efficiency = \frac{8\times10^8}{2.025\times10^9} \times 100 \approx 39.5\%$

4 0

3 years ago

Read 2 more answers

Review Conceptual Example 7 before starting this problem. A uniform plank of length 5.0 m and weight 225 N rests horizontally on

Andreas93 [3]

Answer:

0.82 m

Explanation:

We are given that

Weight, $w_1$ =225 N

Length,l=5 m

d=1.1 m

We have to find the distance x for which person weighs 385 N walk on the overhanging part of the plank before it just begins to tip.

Half length= $\frac{l}{2}=\frac{5}{2}=2.5 m$

$r=\frac{l}{2}-d=2.5-1.1=1.4 m$

$w_2=385 N$

When system in equilibrium then

$w_1r=w_2 x$

$225\times 1.4=385\times x$

$x=\frac{225\times 1.4}{385}$

$x=0.82 m$

6 0

4 years ago

What number will be shown by hydrometer if sunk in pure water ?

serious [3.7K]

The hydrometer displays the density of the liquid you stick it in, COMPARED TO WATER.

If you stick it in pure water, it should read 1.00 . This is a good way to check your hydrometer and see whether it's reading correctly ("calibrated").

7 0

3 years ago

Read 2 more answers

A truck starts from rest with an acceleration of 0.3 m/ S^2 find its speed in km/h when it has moves through 150 m

goblinko [34]

Answer:

v = 34.128 km/hr

Explanation:

Given that,

The initial speed of a truck, u = 0

Acceleration of the truck, a = 0.3 m/s²

Distance moved, d = 150 m

Let the final speed of the truck is v. Using third equation of motion i.e.

$v^2-u^2=2ad\\\\v=\sqrt{u^2+2ad}$

Put all the values,

$v=\sqrt{0^2+2\times 0.3\times 150}\\\\v=9.48\ m/s$

v = 34.128 km/h

So, the final speed of the truck is equal to 34.128 km/h.

6 0

3 years ago