Which statement correctly identifies a difference between the function of most arteries and veins?

an ice skater starts with a velocity 2.25 m/s in a 50.0 degree direction after 8.33s she is moving 4.65 m/s in a 120 degree dire

svetoff [14.1K]

Answer:

$-0.032 m/s^2$

Explanation:

To answer the question, we just need to consider the motion along the horizontal direction.

The component of the initial velocity of the ice skater along the x-direction is:

$u_x = u cos \theta =(2.25)(cos 50^{\circ})=1.45 m/s$

where u = 2.25 m/s is the initial velocity and $50^{\circ}$ is the angle.

The component of the final velocity of the ice skater along the x-direction is

$v_x = u cos \theta =(4.65)(cos 120^{\circ})=-2.33 m/s$

where u = 4.65 m/s is the final velocity and $120^{\circ}$ is the angle.

The acceleration along the x-direction is given by

$a_x=\frac{v_x-u_x}{t}$

where

t = 120 s is the time

Substituting,

$a=\frac{-2.33-(1.45)}{120}=-0.032 m/s^2$

7 0

4 years ago

Energy is released during the fission of pu-239 atoms as a result of the

pav-90 [236]

<h2>Answer: process of converting matter into energy</h2><h2></h2>

Nuclear fission consists of dividing a heavy nucleus into two or more lighter or smaller nuclei, by means of the bombardment with neutrons to make it unstable. In this process that takes place in the atomic nucleus, neutrons, gamma rays and <u>large amounts of energy are emitted. </u>

Then, with this division a great release of energy occurs and the emission of two or three neutrons, other particles and gamma rays.

This means fission is a process in which energy is released by the separation of the components of the nucleous of the atom.

In other words:

<h2>Matter is converted to energy .</h2>

6 0

3 years ago

Two students who live on planet X. They want to estimate the circumference. The two students synchronize their watches before on

dexar [7]

Answer:

72000 miles

Explanation:

If the distance between the students is 600 miles, and this implies in a 3 degree difference in the sun position, that means this 600 miles is related to 3 degrees of the circunference of the planet.

So, to find the whole circunference of the planet, that is, 360 degrees, we just need to use a rule of three:

3 degrees -> 600 miles

360 degrees -> x miles

3x = 600 * 360

x = 600 * 360 / 3 = 72000 miles

7 0

3 years ago

A scientist reports a measurement of the temperature of the surface of a newly discovered planet is -20 K. What conclusion can y

riadik2000 [5.3K]

Answer:

Option B. The planet is a very way from the center or the Sun.

Explanation:

If the surface temperature of the newly formed planet is - 20 K that means the distance of the planet from the sun in greater.

If we look at the temperature trends of the planets in our solar system, the planets closer to the sun like Mercury, Venus have very high surface temperature but as we move move away from the the center of the solar system, i.e., Sun, the temperature goes on decreasing.

4 0

3 years ago

How do I calculate how many meters are in 7.2 light years?

Vikentia [17]

Answer:

68.2 Quadrillion meters

Explanation:

A lightyear is the distance that light travels in one year.

Speed of light is $3*10^8\ m/s$

So light covers 300,000,000 meters in one second.

One year has 31536000 seconds so , light covers

$9.461*10^{15}\ meters\ in\ one\ year$

so 7.2 light years is

$7.2*(9.461*10^{15})\\6.82*10^{16}$

so 7.2 light years is

6.82 x 10^(16) meters or

68.2 Quadrillion meters

5 0

3 years ago