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3 years ago

The graph shows the heating curve of water.

Physics

2 answers:

Lesechka [4]3 years ago

8 0

The answers I got was D and B

Bogdan [553]3 years ago

8 0

1. B
WORKING ON 2....

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A convex lens with a focal length of 10 cm is located 30 cm away from a

zloy xaker [14]

Answer: 15 cm

Explanation:

According to the Lens Equation we have the following:

$\frac{1}{f}=\frac{1}{v}+\frac{1}{u}$ (1)

Where:

$f=10 cm$ is the focal length

$u=30 cm$ is the distance between the candle (the object) and the lens

$v$ is the distance between the image and the lens

Isolating $v$ :

$v=\frac{uf}{u-f}}$ (2)

Solving:

$v=\frac{(30 cm)(10 cm)}{30 cm-10 cm}}$ (3)

Finally:

$v=15 cm$ This is where the image is located

8 0

3 years ago

The force of gravity is an inverse square law. this means that, if you double the distance between two large masses, the gravita

likoan [24]

F~1/r²
doubling the distance r, Decreases the force by ¼

4 0

4 years ago

You walk into the kitchen and see a broken egg on the floor. Which of the following is an inference you can make based on this o

Over [174]

I'd say A. because an inference is a guess/estimate. You can assume that the egg rolled off the kitchen but you know that C and D are true.

6 0

3 years ago

Read 2 more answers

Medical cyclotrons need efficient sources of protons to inject into their center. In one kind of ion source, hydrogen atoms (i.e

antoniya [11.8K]

Answer:

$r=5.278\times 10^{-4}\ m$

Explanation:

Given that:

magnetic field intensity, $B=0.07\ T$

kinetic energy of electron, $KE=1.2\ eV= 1.2\times 1.6\times 10^{-19}\ J= 1.92\times 10^{-19}\ J$

we have mass of electron, $m=9.1\times 10^{-31}\ kg$

<em>Now, form the mathematical expression of Kinetic Energy:</em>

$KE= \frac{1}{2} m.v^2$

$1.92\times 10^{-19}=0.5\times 9.1\times 10^{-31}\times v^2$

$v^2=4.2198\times 10^{11}$

$v=6.496\times 10^6\ m.s^{-1}$

<u>from the relation of magnetic and centripetal forces we have the radius as:</u>

$r=\frac{m.v}{q.B}$

$r=\frac{9.1\times 10^{-31}\times 6.496\times 10^6 }{1.6\times 10^{-19}\times 0.07}$

$r=5.278\times 10^{-4}\ m$

6 0

3 years ago

Suppose you read in the newspaper that a new planet has been found. Its average speed in its orbit is 33 kilometers per second (

Harlamova29_29 [7]

Answer:

E. Kepler's second law says the planet must move fastest when it is closest, not when it is farthest away.

Explanation:

We can answer this question by using Kepler's second law of planetary motion, which states that:

"A line connecting the center of the Sun with the center of each planet sweeps out equal areas in equal intervals of time"

This means that when a planet is further away from the Sun, it will move slower (because the line is longer, so it must move slower), while when the planet is closer to the Sun, it will move faster (because the line is shorter, so it must move faster).

In the text of this problem, it is written that the planet moves at 31 km/s when is close to the star and 35 km/s when it is farthest: this is in disagreement with what we said above, therefore the correct option is

E. Kepler's second law says the planet must move fastest when it is closest, not when it is farthest away.

5 0

3 years ago