The path in which the Sun appears to move over the course of the year is called _____.A. an orbit
B. the ecliptic
C. a revolution
D. the solar nebula

Answers

Answer 1

Answer:
The path in the sky in which the sun appears to travel in the course
of a year is called the ecliptic.

It was thought (and still is by some) that there is something more
important about the constellations along this path, compared to
the constellations that the mighty sun never enters. These are the
constellations of the Zodiac, on which so much of astrology is based.

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The answer to number 9 please

Answers

The magnitude is doubled. The direction doesn't change.

Forces contribute to the net force on a car rolling down a ramp. a. Which force supports the car’s weight?
b. Which force accelerates the car down the ramp?
c. Which force acts against the motion of the car?

Answers

B)Gravity pulls the car downward, also its the only force in the downward direction.
C)Force that acts against is friction.

Which of the following is most closely related to the specific heat of a substance?a. its temperature
b. its melting point
c. its amount of heat transferred
d. its rate of change in temperature

Answers

The following that is is most closely related to the specific heat of a substance is its rate of change in temperature. The answer is letter D. The amount of energy required to raise the temperature of 1 kilogram of a substance by 1 Kelvin is called the specific heat. The answer is a. For example, water. Water has a specific heat of 4.18 Joules per kilogram per Kelvin. This means that in order for water to change from one state to the other at one kelvin, it needs 4.18 Joules of energy per one kilogram of water. But it does not apply to changes in phase, because the heat added or removed during a phase change does not change the temperature of a substance.

A passenger on a boat moving at 1.70 m/s on a still lake walks up a flight of stairs at a speed of 0.60 m/s , as shown in the figure . The stairs areangled at 45o pointing in the direction of motion as shown.

Write the vector velocity of the
passenger relative to the water.
Express your answer using two significant figures. Express
your answer in terms of the
unit vectors i
and j.

Answers

If you wish, you could choose i to be in the same direction as the motion and j in perpendicular direction (upwards).
The two speeds could be expressed as vectors. The speed of the boat is merely $1.7i+0j$ . The speed of the climbing man, using the boat as reference, is more complicated. It is $(0.60)/(√(2))i+(0.60)/(√(2))j=0.30√(2)i+0.30√(2)j$ . Calculate the sums of the two and the speed itself.

a rocket lift off the surface of earth with a constant acceleration of 20 m/sec^2 .how fast will the rocket be going 1 min latter?

Answers

a = v1-v0/t so v1= a*t (v0 is o m/s) v1=
20m/s * 60 s = 1200 m/s

"Acceleration of 20 m/s² " means that the rocket is speeding up,
and its speed becomes 20 m/s greater every second.

Since it started out with zero speed, its speed after 1 minute
(60 seconds) is

(20 m/s /s) · (60 s) = 1,200 m/s .

Energy of a wave is measured in terms of the wave's ?