3 years ago

You cannot get more work out of any machine than what you put into it. 1)True 2)False

Physics

1 answer:

zhenek [66]3 years ago

6 0

That statement is 153% true !

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Geologists apply various methods to study the layers of the Earth. Which of the following is NOT a method used to study the Eart

77julia77 [94]

Answer:

A. Scientists use seismic computer models to measure the atmospheric conditions above the Earth's crust

Explanation:

why would use atmosphere to study the layers of earth? dont think thats possible

8 0

3 years ago

What is the acceleration of a 3 kg rock that is thrown with a force of 18 N?

Ket [755]

Answer:6m/s^2

Explanation:

Mass =3kg

Force=18N

Acceleration =force ➗ mass

Acceleration =18 ➗ 3

Acceleration =6

Acceleration =6m/s^2

7 0

4 years ago

A population has a birthrate of 10/1000 , a death rate of 9/1000, an immigration rate of 3/1000, and an emigration rate of 7/100

Charra [1.4K]

Birth rate 10/1000 = +population

Death rate 9/1000 = -population

Immigration rate 3/1000 = +population

Emigration rate 7/1000 = -population

10/1000 - 9/1000 + 3/1000 - 7/1000= -3/1000

Growth rate = (-3/1000)(100%)= -0.3%

3 0

4 years ago

What factors determine electric potential?

NNADVOKAT [17]

Answer: C. Charge and distance

4 0

3 years ago

A frictionless spring with a 4-kg mass can be held stretched 0.2 meters beyond its natural length by a force of 30 newtons. If t

maxonik [38]

Answer:

The position for mass is $x(t)=36.75sin(37.5t)$

Explanation:

Let x(t) donate the position of mass at time t,Then x satisfies the differential equation

$m\frac{d^2x}{dt^2} +kx=0\\here\\m=4kg\\k=30N/0.2m\\thus\\w^2=k/m=30N/0.2m*4kg=37.5$

The general solution is

$(x)t=C_{1}cos(37 .5t)+C_{2}sin(37.5t)$

It follows

$x'(t)=-37.5C_{1}sin(37.5t)+37.5C_{2}cos(37.5t)\\now\\x(0)=0\\gives\\C_{1}=0\\ and\\x'(0)=1m/s\\gives\\C_{2} =36.75$

thus the position of mass is

$x(t)=36.75sin(37.5t)$

7 0

3 years ago