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Mazyrski [523]
3 years ago
13

A research group at Dartmouth College has developed a Head Impact Telemetry (HIT) System that can be used to collect data about

head accelerations during impacts on the playing field. The researchers observed 249,613 impacts from 423 football players at nine colleges and high schools and collected collision data from participants in other sports. The accelerations during most head impacts ( > 89% ) in helmeted sports caused head accelerations less than a magnitude of 400 m/s2. However, a total of 11 concussions were diagnosed in players whose impacts caused accelerations between 600 and 1800 m/s2, with most of the 11 over 1000 m/s2.
Use equation 2ax(x−x0)=v2x−v20x to determine the stopping distance. Suppose that the magnitude of the head velocity change was 11 m/s and acceleration was1000 m/s2.
Physics
1 answer:
Olin [163]3 years ago
3 0

Answer:

6.05 cm

Explanation:

The given equation is

2 aₓ(x-x₀)=( Vₓ²-V₀ₓ²)

The initial head velocity V₀ₓ =11 m/s

The final head velocity  Vₓ is 0

The accelerationis given by =1000 m/s²

the stopping distance = x-x₀=?

So we can wind the stopping distance by following formula

2 (-1000)(x-x₀)=[0^{2} -11^{2}]

x-x₀=6.05*10^{-2} m

       =6.05 cm

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Which statements are false? Money comes in different forms. Money is indivisible. M1 includes notes, coins, and funds in checkab
Ainat [17]

Answer: Money is indivisible and Credit cards are used primarily to withdraw money from a checking account are two false statements.

Explanation:

Since we know the characteristics of money as follows:

1) Money is divisible.

2) Money has different forms - coins, notes, demand deposits, cheques, tokens, funds in checkable deposits etc.

3) Money is a unit of account.

4) Money is measure of value.

5) Money is store of value.

So, Money is indivisible is false.

And credit cards are used primarily to withdraw money from a checking account is false , as debit cards are used for withdrawing money.

Hence, Money is indivisible and Credit cards are used primarily to withdraw money from a checking account are two false statements.

3 0
3 years ago
Read 2 more answers
Can anyone help me out with this question please? It has to be right thanks so much
Vladimir79 [104]

it is basalt which is an igneous rock

 

8 0
3 years ago
A hot metal bolt of mass 0.06 kg and specific heat capacity 899 J/kg°C is dropped into a calorimeter containing 0.16 kg water at
skad [1K]

Answer:

Explanation:

Given

mass of hot metal m_1=0.06\ kg

specific heat c=889\ J/kg-^{\circ}C

mass of water m_2=0.16\ kg

Temperature pf water T_2=20^{\circ}C

Final Temperature T=25^{\circ}C

let T_1 be the temperature of hot metal ball

Heat lost by heat metal bolt is gained by water in calorimeter

Heat lost by hot metal bolt Q_1=m\times c\times \Delta T

Q_1=0.06\times 889\times (T-25)

Heat gained by water Q_2=m_2\times c_w\times \Delta T

Q_2=0.16\times 4184\times (25-20)

Q_1=Q_2

0.06\times 889\times (T-25)=0.16\times 4184\times (25-20)

T_1=25+62.75

T_1=87.75^{\circ}C

7 0
3 years ago
The cylindrical tub of a dryer in a laundromat rotates counterclockwise about a horizontal axis at 41.5 rev/min as it dries the
frozen [14]

Answer:

\theta = 49.81^0

Explanation:

Given that:

\omega = 41.5 \ rev/min\\\\\omega = 41.5 *\frac{1}{60}* 2 \pi\\\\\omega = 4.45 \ rad/s\\\\\\diameter = 0.748 m

If we let the piece of the close lose contact at ∠θ;

Then ; from force balance;

we have:

\\\\mg sin \theta = \frac{mv^2}{r}\\\\sin \theta = \frac{2v^2}{dg}\\\\\theta = sin^{-1} (\frac{2v^2}{dg})

where;

v = \frac{\omega d}{2}\\\\v =  \frac{4.45 *0.748}{2}\\\\v = 1.6643\\\\v^2 = 2.77

Again:

\theta = sin^{-1}(\frac{2v^2}{dg})\\\\\theta = sin^{-1}( \frac{2*2.77}{0.74*9.8})\\\\\theta = 49.81^0

6 0
3 years ago
the thermometer has its stem marked in millimeter instead of degree Celsius. the lower fixed point is 30mm and the upper fixed p
Lorico [155]

10°c

Explanation:

Given parameter;

Lower fixed point = 30mm

Upper fixed point = 180mm

Reading = 45mm

Unknown:

The degree celcuis temperature at 45mm = ?

Solution:

To solve this problem we simply compare the mm- scale to the celcius - scale that we know.

The upper fixed point is the boiling point of water

Lower fixed point is the freezing point of water

This shows that both the upper and lower fixed point of both thermometers are the same;

         mm-scale          °c scale

          180mm               100°c

            45mm                x

          30mm                  0°c

Solving;

                     \frac{x - 0}{100 -0} =  \frac{45 - 30 }{180- 30}

   x (150) = 100  x 15

   x = 10°c

learn more:

Temperature scales brainly.com/question/1603430

#learnwithBrainly

 

7 0
3 years ago
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