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3 years ago

Physics question please show work for brainliest :)

Physics

2 answers:

kykrilka [37]3 years ago

7 0

The Impact of Physics on Society. Physics is the study of our natural world. From the microscopic level of particles to the macroscopic level of space, physics has changed our understanding of the universe and in doing so, has changed our philosophy and way of life.

navik [9.2K]3 years ago

5 0

A. A car comes equipped with side airbags. I don't know how I'm supposed to show work but that's the answer

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PLEASE HELP - basic SUVAT stuff

Goryan [66]

Answer:

1. 5 m/s

2. 8 m/s

3. 10 s

4. 3 m/s

Explanation:

1. Average speed = distance / time

s = 20 m / 4 s

s = 5 m/s

2. First, find the time to travel from A to B:

60 m = 10 m/s × t

t = 6 s

Now find the average speed from A to C:

s = 80 m / (6 s + 4 s)

s = 8 m/s

3. If t is the time traveling from C back to B, and the average speed of the whole trip is 5 m/s, then:

5 m/s = 100 m / (6 s + 4 s + t)

t = 10 s

4. Average velocity = displacement / time

v = 60 m / 20 s

v = 3 m/s

6 0

3 years ago

The surface tension of water was determuned in a laboratory by using the drop weight method. 100 drops were released from a bure

lana [24]

Answer:

The surface tension of the water is 6.278×10⁻² N/m

error = 13.65%

Explanation:

The surface tension of water is given by

$\gamma = \frac{F}{L}$

Where F is the force acting on water and L is the length over which is force is acted.

We are given the mass of 100 droplets of water

M = 3.78 g

n = 100

The mass of 1 droplet is given by

$m = \frac{M}{n} \\\\m = \frac{3.78}{100}\\\\m = 0.0378 \: g \\\\m = 3.780\times10^{-5} \: kg$

The force acting on a single droplet of water is given by

$F = m \cdot g$

Where m is the mass of water droplet and g is the acceleration due to gravity

$F = 3.780\times10^{-5} \cdot 9.81$

$F = 3.708\times10^{-4} \: N$

The circumferential length of the droplet is given by

$L = \pi \cdot d$

Where d is the diameter

$L = \pi \cdot 1.88\times10^{-3}\\\\L = 5.906 \times10^{-3} \: m$

Now we can find out the required surface tension of the water

$\gamma = \frac{3.708\times10^{-4} }{5.906 \times10^{-3}} \\\\\gamma = 0.06278\: N/m\\\\\gamma = 6.278 \times10^{-2} \: N/m\\\\$

Therefore, the surface tension of the water is 6.278×10⁻² N/m

The tabulated value of the surface tension of water at 20 °C is given by

$\gamma_t = 0.0727 \: N/m$

The percentage error between tabulated and calculated surface tension is given by

$error = \frac{\gamma_t - \gamma }{\gamma_t}$

$error = \frac{ 0.0727 - 0.06278}{0.0727} \times 100\%$

$$ error = 13.65 \%$

7 0

3 years ago

A ball is kicked horizontally with a speed of 5.0 ms-1 from the roof of a house 3 m high. When will the ball hit the ground?

Burka [1]

Answer:

the time taken for the ball to hit the ground is 0.424 s

Explanation:

Given;

velocity of the ball, u = 5 m/s

height of the house which the ball was kicked, h = 3m

Apply kinematic equation;

h = ut + ¹/₂gt²

where;

h is height above ground

u is velocity

g is acceleration due to gravity

t is the time taken for the ball to hit the ground

Substitute the given values and solve for t

3 = 5t + ¹/₂(9.8)t²

3 = 5t + 4.9t²

4.9t² + 5t -3 = 0

a = 4.9, b = 5, c = -3

Solve for t using formula method

$t = \frac{-5 +/-\sqrt{5^2-4(4.9*-3)}}{2(4.9)} = \frac{-5+/-(9.154)}{9.8} \\\\t = \frac{-5+9.154}{9.8} \ or \ \frac{-5-9.154}{9.8} \\\\t = \frac{4.154}{9.8} \ or \ \frac{-14.154}{9.8} \\\\t = 0.424 \ sec \ or -1.444 \ sec\\\\Thus, t = 0.424 \ sec$

5 0

3 years ago

Answer please 98 points also brainliest

Yuri [45]

the answer is D) The air in the aquarium is saturated

none of the other answers were realistic AND I took this before so I know the right answer.

5 0

4 years ago

Read 2 more answers

. Are there human health risks from exposure (or overexposure) to X-rays? If so:

algol [13]

<h3>yes, there are human health risks caused by exposure to x rays</h3>

describe the main risk (s) ::: - may cause damage to cells in the body

- large doses may lead cells to be cancerous

- causes mutations in the DNA

describe common sources of exposure ( or overexposure ) :::

- natural background radiation e.g. - cosmic rays

- medical radiation e.g. - CT scans & medical x - rays

- man - made radiation e.g. - airport security scanners

describe a technology, device, or behavior that can be used for protection, or to decrease exposure :::

- x - ray beam filters

- digital x - ray detectors

- technologies reduce radiation doses in radiography &

mammography

<em>hope that helps !!</em>

3 0

3 years ago

Read 2 more answers