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erastovalidia [21]

4 years ago

12

Types of mechanical waves include

1 answer:

USPshnik [31]4 years ago

4 0

I think surface waves

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What is the first and second law of thermodynamics

ElenaW [278]

<span>The first law, also known as Law of Conservation of Energy, states that energy cannot be created or destroyed in an isolated system. The second law of thermodynamics states that the entropy of any isolated system always increases. hope this helps you!</span>

6 0

3 years ago

Read 2 more answers

A ball is dropped from a height of 23.5 meters. Assuming no air resistance, how many seconds will it take the ball to hit the

Alex Ar [27]

Answer:

About 2.19 seconds

Explanation:

$d=v_ot+\dfrac{1}{2}at^2$

Since the ball is dropped from rest, there is no initial velocity, and you can write the following equation:

$23.5=\dfrac{1}{2}(9.8)t^2 \\\\t^2\approx 4.79 \\\\t\approx 2.19s$

Hope this helps!

8 0

3 years ago

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India used 600 joules of work on a steel block and moved it 4.8 meters. How much forced was used ?

dangina [55]

The formula for finding force is F=W/d so then you plug in the numbers:
F=600/4.8
F=125N

8 0

3 years ago

The vertical motion of mass A is defined by the relation x 5 10 sin 2t 1 15 cos 2t 1 100, where x and t are expressed in millime

nikklg [1K]

Explanation:

Given that,

The vertical motion of mass A is defined by the relation as :

$x=10\ sin2t+15\ cos2t+100$

At t = 1 s

$x=10\ sin2+15\ cos2+100$

x = 115.33 mm

(a) We know that,

Velocity, $v=\dfrac{dx}{dt}$

$v=\dfrac{d(10\ sin2t+15\ cos2t+100)}{dt}$

$v=20\ cos2t-30\ sin2t$

At t = 1 s

$v=20\ cos2-30\ sin2$

v = 18.94 mm/s

We know that,

Acceleration, $a=\dfrac{dv}{dt}$

$a=\dfrac{d(20\ cos2-30\ sin2)}{dt}$

$a=-40\ cos2t-60\ cos2t$

At t = 1 s

$v=-40\ cos2-60\ cos2$

$a=-99.93\ mm/s^2$

(b) For maximum velocity, $\dfrac{dv}{dt}=a=0$

$-40\ cos2t-60\ cos2t=0$

t = 45 seconds

For maximum acceleration, $\dfrac{da}{dt}=0$

$80\ sin2t+120\ cos2t=0$

t = 61.8 seconds

Hence, this is the required solution.

5 0

4 years ago

1. A car with a mass of 1,500 kilograms is moving around a circular curve at a uniform velocity of 16 m/s. The curve has a radiu

svet-max [94.6K]

<u>Answers</u>

1) 3,840 N

2) 80 m

<u>Explanations</u>

Centripetal force is the force that maintenance objects that are moving in a circular motion.

F = mv²/r

= (1500 × 16²)/100

= (1500×256)/100

= 384000/100

= 3,840 N

2) F = (mv²)/r

6000 N = (1200 × 20²)/r

r = (1200 × 400)/6000

= 480,000/6000

= 80 m

5 0

4 years ago

Read 2 more answers