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3 years ago

When is a white dwarf formed?

2 answers:

6 0

When a red giant has insufficient mass it pretty much sheds its outer layer to leave the center core know as the white dwarf

mario62 [17]3 years ago

6 0

After a star sheds its outer layers and forms a planetary nebula it will leave behind a core which is the remnant white dwarf

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Let at time t1 means?

Zolol [24]

It means that you note down the observation at time t = t1 of some experiment which you are performing.

7 0

3 years ago

9. Studying earthquake waves, density experiments, and observations of meteorites are ways that we study the

Svet_ta [14]

The answer is A. Circumstantial

5 0

2 years ago

A small rock is thrown vertically upward with a speed of 22.0 m/s from the edge of the roof of a 30.0-m-tall building. The rock

denis-greek [22]

Answer:

a) $v=32.74\frac{m}{s}$ .

b) $t=\frac{v-v_0}{g} =5.58s$ .

Explanation:

a) What is the speed of the rock just before it hits the street?

From Kinematics we have $v^2= v_0^2+2a(y_f-y_i)$ .

If we take the top of the roof as the position $y_0=0m$ , then

$y_f=-30m$ and we have (also, $a=g=-9.8\frac{m}{s^2}$ ) :

$v^2= v_0^2+ 2ay_f$ ⇒ $v= \sqrt{v_0^2+ 2ay_f}$

⇒ $v=32.74\frac{m}{s}$ .

b) How much time elapses from when the rock is thrown until it hits the street?

From Kinematics we have $v(t)=v_0+at=v_0+gt$

When the rock touches the ground:

$v=-32.74\frac{m}{s}$

With a minus sign to indicate the vector velocity points down.

$t=\frac{v-v_0}{g} =5.58s$

(remember that $g=-9.8\frac{m}{s^2}$ )

3 0

3 years ago

A block of mass 200g is oscillating on the end of a horizontal spring of spring constant 100 N/m and natural length 12 cm. When

malfutka [58]

In order to determine the acceleration of the block, use the following formula:

$F=ma$

Moreover, remind that for an object attached to a spring the magnitude of the force acting over a mass is given by:

$F=kx$

Then, you have:

$ma=kx$

by solving for a, you obtain:

$a=\frac{kx}{m}$

In this case, you have:

k: spring constant = 100N/m

m: mass of the block = 200g = 0.2kg

x: distance related to the equilibrium position = 14cm - 12cm = 2cm = 0.02m

Replace the previous values of the parameters into the expression for a:

$a=\frac{(\frac{100N}{m})(0.02m)}{0.2\operatorname{kg}}=10\frac{m}{s^2}$

Hence, the acceleration of the block is 10 m/s^2

8 0

1 year ago

Which item is a pure substance?

hram777 [196]

Answer:

Solid gold. 10 carat indicates gold purity is not 100%. For 24 karat gold is pure gold.

Explanation:

8 0

3 years ago

Read 2 more answers