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Pie
2 years ago
6

Sam is recklessly driving 60 mph in a 30 mph speed zone when he suddenly sees the police. he steps on the brakes and slows to 30

mph in three seconds, looking nonchalant as he passes the officer. how far does he travel while braking?
Physics
1 answer:
barxatty [35]2 years ago
5 0
For this problem, we use the derived equations for rectilinear motion at constant acceleration. The equations used for this problem are:

a = (v - v₀)/t
2ax = v² - v₀²
where
a is the acceleration
x is the distance
v is the final velocity
v₀ is the initial velocity
t is the time

The solution is as follows;

a = (60mph - 30 mph)/(3 s * 1 h/3600 s)
a = 36,000 mph²

2(36,000 mph²)(x) = 60² - 30²
Solving for x,
x = 0.0375 miles
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A 2-kg toy car is held at a height of 3.75 m above the floor. How much work is done
lisabon 2012 [21]

Answer:

work = 0

Explanation:

Let's remember that work is defined as the product of a force by a distance. Distance is the physical path displaced by the body under the action of that force.

W = F * d

where:

W = work [J]

F = force [N]

d = distance [m]

In this case, the toy is held at a height, there is no displacement from one point to another. So there is no work and this is equal to zero.

W = (2*9.81) * 0 = 0 [Joules]

4 0
3 years ago
The density of water is about 1 gram per milliliter. A milliliter is a cubic centimeter (i.e., cm3 ). A red blood cell has a den
elixir [45]

Answer:

The mass in grams of a red blood cell is about 7.85 ×  10⁻¹¹ grams

Explanation:

To find the mass in grams of a red blood cell,

From,

Density = \frac{Mass}{Volume}

Then,

Mass = Density \times Volume

From the question,

Density of a red blood cell is similar to that of water

Density of water = 1 g/mL = 1 g/ cm³

Then, Density of a red blood cell = 1 g/cm³

Now, we will find the volume a red blood cell.

From the question,  

  • A red blood cell is shaped like a one micrometer thick disk with a diameter of about 10 micrometers

Since the shape is like that of a thick disc, we can determine the volume by using the formula for volume of a cylinder.

Hence,

Volume of a red blood cell = \pi r^{2}h

Where \pi Is a constant (Take \pi = 3.14)

r is the radius

and h is the thickness

Diameter of a red blood cell = 10 micrometers

Then, radius of a red blood cell = 10/2 micrometers = 5 micrometers

r = 5 micrometers = 5 × 10⁻⁶ meters

and h = 1 micrometer = 1 × 10⁻⁶ meters

Hence,

Volume of a red blood cell = 3.14 × (5 × 10⁻⁶)² × 1 × 10⁻⁶

∴ Volume of a red blood cell = 7.85 × 10⁻¹⁷ cubic meter (m³)

Convert this to cubic centimeter

(NOTE: 1 cubic meter = 1000000 cubic centimeter)

Hence,

Volume of a red blood cell = 7.85 ×  10⁻¹¹ cubic centimeter (cm³)

Now, for the mass

Mass = Density \times Volume

Density of a red blood cell = 1 g/cm³

Volume of a red blood cell = 7.85 ×  10⁻¹¹ cubic centimeter (cm³)

Then,

Mass = 1 g/cm³ ×  7.85 ×  10⁻¹¹ cm³

Mass = 7.85 ×  10⁻¹¹ g

Hence, the mass in grams of a red blood cell is about 7.85 ×  10⁻¹¹ grams

4 0
3 years ago
Describe what will happen to the sun when it runs out of fuel.
Anni [7]

Answer:

It will expand to a big red puff, and it will eventually settle down and turn into a white dwarf star, cooling down slowly by a trillion years.

Explanation:

5 0
3 years ago
Answer if you actually have the answer unlike Miss Madhumitaa!!!!
vodomira [7]
It’s the first one 28282929/9292
4 0
2 years ago
Read 2 more answers
When you drop a 0.43 kg apple, Earth ex erts a force on it that accelerates it at 9.8m / (s ^ 2) toward the earth's surface. Acc
Sever21 [200]

Answer:

The answer to the question is highlighted in the box

8 0
10 months ago
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