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4 years ago

Stages of global warming

Physics

1 answer:

ddd [48]4 years ago

7 0

Answer:

- Glaciers melt

- The seas rise

- Temperature changes

- Humans add heat trapping greenhouse gasses

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A 60-kg swimmer suddenly dives horizontally from a 150-kg raft with a speed of 1.5 m/s. The raft is initially at rest. What is t

scZoUnD [109]

I’m almost positive it 60 m/s

7 0

3 years ago

Calculate the size of the magnetic field 20 m below a high voltage power line. The line carries 450 MW at a voltage of 300,000 V

Stells [14]

Answer:

$1.5 \times 10^{-5} \mathrm{~T}$ .

Explanation:

Power carried by the line $=P=450 \mathrm{MW}=450 \times 10^{6} \mathrm{~W}$

Voltage across the line Volts

Current flowing in the line =i

Size of magnetic field =B

Distance from the line

Formula Used:

Current flowing is given as

$i=\frac{P}{\Delta V}$

Magnetic field by the current carrying wire is given as

$B=\left(\frac{\mu}{4 \pi}\right)\left(\frac{2 i}{r}\right)$

Inserting the values

$B=\left(10^{-7}\right)\left(\frac{2(1500)}{(20)}\right) \\
B=1.5 \times 10^{-5} \mathrm{~T}$

Conclusion:

Thus, the magnetic field comes out to be $1.5 \times 10^{-5} \mathrm{~T}$ .

7 0

3 years ago

Fiona followed these steps for a scientific investigation: 1. Collect baking soda and vinegar 2. Pour baking soda into a bowl. 3

horrorfan [7]

<u>Answer:</u> The correct statement is combining baking soda and vinegar will cause a chemical change.

<u>Explanation:</u>

A chemical reaction is defined as the reaction in which two or more chemical substances react to form two or more different chemical substances

A new substance (product) is formed in a chemical reaction when the bonds between the reactants are broken so that the new bonds between the products can be formed.

A physical process is defined as the process in which the physical state of matter takes place. Like, in the process of vaporization, a liquid state changes to the gaseous state without changing the composition of species.

When baking soda (Sodium bicarbonate) is reacted with vinegar (acetic acid), it leads to the formation of sodium acetate, water, and carbon dioxide.

A new compound is getting formed in this process which is denoted by the chemical equation:

$NaHCO_3+CH_3COOH\rightarrow CH_3COONa+H_2O+CO_2$

Hence, the correct statement is combining baking soda and vinegar will cause a chemical change.

7 0

3 years ago

A car travels 180 miles in 4 houra. calculate the avrage speed of tye car in mph

saw5 [17]

D = vt

where:
v = speed
d = distance
t = time

Based on the formula, each quantity is directionally proportional to each other. Since we don't have enough numbers to work with, we will utilize our concept skills.

If the car travels half the speed, then the car is slowing down and covers a short distance in a certain amount of time than it did originally. So we divide the default distance by 2.

180 / 2 = 90

The new distance so far is 90 miles.

But now it takes the car 3 times as long to get to its destination. The longer it takes, the more distance you will cover. Multiply the current distance by 3.

90 * 3 = 270

5 0

3 years ago

Read 2 more answers

A golfer starts with the club over her head and swings it to reach maximum speed as it contacts the ball. Halfway through her sw

Luda [366]

Answer:

approximately toward the golfer's feet

Explanation:

The golf club experiences two accelerations. when the club is horizontal, centripetal acceleration acts on it toward the center parallel to the ground. The tangential acceleration acts towards the ground in downward direction. So when the golf club is horizontal, the acceleration vector is given by the combination of tangential and centripetal acceleration. the acceleration vector thus points in between horizontal and vertical direction . hence towards the golfer's feet.

7 0

3 years ago