Which of the following cannot be transmitted through avacuum?
a. ocean waves
b. UV rays
C. Laser
d. X-rays
e. microwave

Answers

Answer 1

Answer: A, C its not possible newtons law

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During a phase change what happens to the temperature?

Why are solids good at transferring heat through conduction? A.The particles are close together. B.The particles do not move. C.The particles give off electromagnetic waves. D.The particles can slide past one another.

Answers

Answer: the particles are close together

Explanation:

i think it's B. because in heat conduction particles doesn't move and the heat transfer from the high energetic power to less energetic particle

Modern oil tankers weigh over a half-million tons and have lengths of up to a quarter of a mile. Such massive ships require a distance of 5.0 km (about 3.0 mi) and a time of 22 min to come to a stop from a top speed of 26 km/h. What is the magnitude of such a ship's average acceleration in m/s2 in coming to a stop? What is the magnitude of the ship's average velocity in m/s?Comment on the potential of a tanker running aground

Answers

Answer :

Average acceleration, $a=-7.71* 10^(-5)\ m/s^2$

Average velocity, v = 13 km/h

Explanation:

It is given that,

Initial velocity of ship, v = 26 Km/h

Final velocity of ship, u = 0

Distance covered by ship, d = 5 km

Time taken, t = 22 min = 0.36 h

(a) Average acceleration, $a=(v-u)/(t)$

$a=(0-26\ km/h)/(0.36\ h)$

$a=-72.2\ km/h^2=-7.71* 10^(-5)\ m/s^2$

So, the magnitude of ship's acceleration is $a=-7.71* 10^(-5)\ m/s^2$ .

(b) Average velocity, $v_a=(v+u)/(2)$

$v_a=(26\ m/s+0)/(2)$

$v_a=13\ km/h$

So, ship's average velocity is 13 km/h.

Hence, this is the required solution.

Acceleration = (change in speed) / (time for the change)

Change in speed= (0 - 26 km/hr) = -26 km/hr

(-26 km/hr) x (1,000 m/km) x (1 hr / 3,600 sec) = -7.222 m/sec

Average acceleration = (-7.222 m/s) / (22 min x 60sec/min) = -0.00547 m/sec²

Average speed during the stopping maneuver =

(1/2) (start speed + end speed) = 13 km/hr = 3.6111 m/sec

Chances of running aground:

If he stays in the designated shipping lanes, he ought to be OK.

A 2000-kg car traveling at 40m/s hits a wall with a force of 40,000N and comes to a stop what was the impact time?A-0.5s
B-2s
C-400s
D-800s

Answers

Answer:

Option (B)

Explanation:

mass of car, m = 2000 kg, initial velocity of car, u = 40 m/s,

Force, F = 40,000 N, Final velocity, v = 0 m/s

Let the impact time be t.

By use of Newton's second law

F = m a

where, a be the acceleration and m be the mass.

40000 = 2000 x a

a = 20 m/s^2

Acceleration is negative because the car is stopped.

Use first equation of motion,

v = u + a x t

0 = 40 - 20 x t

t = 2 second

D- 800 s I think I did (40,000)(40)/2000 idk if this is the right answer

Approximately, how far is the earth from the Sun? 15,000 km 150,000 km 150,000,000 km 150,000,000,000 km

Answers

Answer: Earth is around 150,000,000 km far from the Sun.

Explanation:

Earth is the third planet in Our Solar System which revolves around the Sun.

The distance of Earth from Sun is 149.6 million kilometers which can be approximated to 150 million km.

Using the conversion factor:

$\text{1 million km}=10^6km$

Now, converting 150 million km to kilometers, we get:

$\text{150 million km}=150*n 10^6km=150,000,000km$

Hence, Earth is around 150,000,000 km far from the Sun.

the earth is approximately 150,000,000 km away from the sun

Which type of energy transfer occurs when a beaker of water is heated on a hot plate?

Answers

Answer:

Convection is the transfer of thermal energy from one place to another by the movement of gas or liquid particles. How does this happen? As a gas or liquid is heated, the substance expands. This is because the particles in liquids and gases gain kinetic energy when they are heated and start to move faster.

Answer:Convection is the transfer of thermal energy from one place to another by the movement of gas or liquid particles. How does this happen? As a gas or liquid is heated, the substance expands. This is because the particles in liquids and gases gain kinetic energy when they are heated and start to move faster.

Which of the following is a true statement about objects in a vacuum?A. A feather will fall faster than a bowling ball.
B. A feather will fall slower than a bowling ball.
C. A feather and a bowling ball will fall at the same rate.
D. Both a feather and a bowling ball can't fall, but will always remain motionless.