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jarptica [38.1K]

3 years ago

11

A particle starts with a speed of 12m/s and moves in a straight line in such a way that its speed increases by 4m/s every second

. Find the speed of the particle just after 8 seconds.

1 answer:

nikitadnepr [17]3 years ago

6 0

Answer:

44m/s is the speed of that particle after 8 seconds

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18. A simple series circuit has a current of 2 A

QveST [7]

I think it is;
Current = vtotal/requ
2A = vtotal/0.5
2*0.5= vtotal
1=vtotal

5 0

2 years ago

Larger animals use proportionately less energy than smaller animals; that is, it takes less energy per kg to power an elephant t

marin [14]

Answer:

Part a)

$Q = 952 cal/day$

Part b)

$P = 46 Watt$

Part c)

$\Delta P = 54 W$

Explanation:

As we know that 5000 kg African elephant requires 70,000 Cal for basic needs per day

so we will have

$m = 5000 kg$

$Q = 70,000 Cal$

so we have energy required per kg

$E = \frac{70,000}{5000}$

$E = 14 cal/kg$

Part a)

now we know that per kg the energy required will be same

so we have mass of the human is 68 kg

so energy required per day is given as

$Q = 68 \times 14$

$Q = 952 cal/day$

Part b)

Resting power is the rate of energy in Joule required per sec

so it is given as

$P = \frac{952 \times 4186}{24\times 3600}$

$P = 46 Watt$

Part c)

resting power given in the book is

$P' = 100 W$

so this is less than the power given

$\Delta P = 100 - 46$

$\Delta P = 54 W$

6 0

3 years ago

Which of these does NOT result in the acceleration of an object?

Zanzabum

I guess the correct answer is the first one.

6 0

3 years ago

Read 2 more answers

Penguin #1 travels at speed v=0.9 c relative to penguin #2. At the instant that both are at the origin, they synchronize their c

Alekssandra [29.7K]

Answer:

L = 0.44 [m]

Explanation:

Here we can use the Lorentz transformation related to length to solve it:

$L=L_{0}\sqrt{1-\beta^{2}}$

<u>Where</u>:

L₀ is the length of the moving reference frame (penguin #1)

L is the length of the fixed reference frame (penguin #2)

β is the ratio between v and c

<u>We know that v = 0.9c so we can find β.</u>

$\beta = \frac{0.9c}{c}=0.9$

$L=1 [m]\sqrt {1-0.9^{2}} = 0.44 [m]$

Therefore, the length of the meter stick of #1 observed by #2 is 0.44 m.

I hope it helps you!

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4 years ago

1ST TO ANSWER GET BRAINLIEST ANSWER How old do u need to be to drink Beer

NISA [10]

The age limit to drink beer is 17 or 18 and up

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4 years ago