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andrezito [222]

2 years ago

7

Which metals have similar chemical properties? Check all that apply.

2 answers:

galina1969 [7]2 years ago

7 0

Barium, beryllium, radium, and calcium.

Alika [10]2 years ago

3 0

Answer:

yes

Explanation:

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From the deepest to the surface, what are the parts of the earth's interior?

shepuryov [24]

The answer is A: Core --> Mantle --> Crust.

Core: The earth's core is the center of the earth, which would ultimately be the deepest. The core is made up of alloy, which is a mixture of many medals, such as iron and nickel.

Mantle: The earth's mantle is the layer between the earths crust and core. Often made of silicate rocks.

Crust: The earth's crust is the outer-most of the three options. Usually made of up different types of rocks.

3 0

2 years ago

State the term used to describe the turning force exerted by the man

ozzi

]A force called the effort force is applied at one point on the lever in order to move an object, known as the resistance force, located at some other point on the lever.

The way levers work is by multiplying the effort exerted by the user. Specifically, to lift and balance an object, the effort force the user applies multiplied by its distance to the fulcrum must equal the load force multiplied by its distance to the fulcrum. Consequently, the greater the distance between the effort force and the fulcrum, the heavier a load can be lifted with the same effort force.

8 0

1 year ago

The current through an inductor of inductance L is given by I(t) = Imax sin(ωt).

sammy [17]

Answer:

(a) $emf_L=-LI_{max}\omega cos(\omega t)$

(b) neither increasing or decreasing

(c) opposite to the flow of charge carriers

Explanation:

The current through an inductor of inductance L is given by:

$I(t)=I_{max}sin(\omega t)$ (1)

(a) The induced emf is given by the following formula

$emf_L=-L\frac{dI}{dt}$ (2)

You derivative the expression (1) in the expression (2):

$emf_L=-L\frac{d}{dt}(I_{max}sin(\omega t))\\\\emf_L=-LI_{max}\omega cos(\omega t)$

(b) At t=0 the current is zero

(c) At t = 0 the emf is:

$emf_L=-\omega LI_{max}$

w, L and Imax have positive values, then the emf is negative. Hence, the induced emf is opposite to the flow of the charge carriers.

(d) read the text carefully

6 0

2 years ago

Que es una variable independiente ?

nlexa [21]

Answer:

Variable independiente

Explanation:

una variable independiente. Es una variable que está sola y no es modificada por las medidas de otras variables

7 0

2 years ago

A spring (70 N/m ) has an equilibrium length of 1.00 m. The spring is compressed to a length of 0.50 m and a mass of 2.0 kg is p

madreJ [45]

Answer:

Part a)

$L = 0.68 m$

Part b)

$L = 0.63 m$

Explanation:

Part a)

As we know that there is no friction in the path

So here we can use energy conservation to find the distance moved by the mass

Initial spring energy = final gravitational potential energy

so we will have

$\frac{1}{2}kx^2 = mgL sin\theta$

$\frac{1}{2}70(0.5)^2 = 2(9.81)(L) sin41$

$8.75 = 12.87 L$

$L = 0.68 m$

Part b)

Now if spring is connected to the block then again we can use energy conservation

so we will have

$\frac{1}{2}kx^2 = mg(x + x')sin\theta + \frac{1}{2}kx'^2$

so we will have

$\frac{1}{2}(70)(0.5^2) = 2(9.81) (0.50 + x') sin41 + \frac{1}{2}(70)x'^2$

$8.75 = 6.43 + 12.87 x' + 35 x'^2$

$x' = 0.13 m$

so total distance moved upwards is

$L = 0.5 + 0.13 = 0.63 m$

8 0

2 years ago