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Dahasolnce [82]

2 years ago

7

When you jump from an elevated position you usually bend your knees upon reaching the ground, which makes the time of the contac

t about 10 times that of a stiff-legged landing. In this way the average force your body experiences is Group of answer choices about 10 times as great. more than 1/10 as great. about 1/10 as great. less than 1/10 as great.

1 answer:

masya89 [10]2 years ago

5 0

Answer:

The correct option is c. about 1/10 as great

Explanation:

The problem can be understood by the concept of impulse. Impulse is a integral of force.

Impulse = Force × Time

As when we bend our knees upon reaching the ground the time of contact is about 10 times that of a stiff-legged. so,

$(Time)_{bend}$ = 10 × Time

So the force will be:

Force = $\frac{Impulse}{(Time)_{bend} }$

Force = $\frac{Impulse}{10* Time}$

Force = $\frac{1}{10}$ × $\frac{Impulse}{Time}$

Hence the force is one tenth of the total as seen by the calculation.

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The mass of a sample of iron is 31.5 g. The volume is 5 cm3. What is the density of iron in g/cm3?

ELEN [110]

Answer : 6.3 g/cm3
Step by step explanation:
Density = mass/volume

3 0

2 years ago

The largest hailstone every measured fell in Vivian, Nebraska in 2010. The circumference of that hailstone was 19 inches. Using

Crazy boy [7]

Answer:

6.04788 in

$115.82654\ in^3$

78.38779 m/s

0.88159 kg

34.55294 J

Explanation:

Circumference is given by

$c=2\pi r\\\Rightarrow r=\dfrac{c}{2\pi}\\\Rightarrow r=\dfrac{19}{2\pi}\\\Rightarrow r=3.02394\ in$

Diameter is given by

$d=2r\\\Rightarrow d=2\times 3.02394\\\Rightarrow d=6.04788\ in$

The diameter is 6.04788 in

$6.04788\times 2.54=15.3616152\ cm$

Volume of sphere is given by

$v=\dfrac{4}{3}\pi r^3\\\Rightarrow v=\dfrac{4}{3}\pi 3.02394^3\\\Rightarrow v=115.82654\ in^3$

The volume is $115.82654\ in^3$

$115.82654\times \dfrac{1}{1728}=0.06702\ ft^3$

Fall velocity is given by

$V=k\sqrt{d}\\\Rightarrow V=20\sqrt{15.3616152}\\\Rightarrow V=78.38779\ m/s$

The velocity of the fall will be 78.38779 m/s

Mass is given by

$m=\rho v\\\Rightarrow m=29\times 0.06702\\\Rightarrow m=1.94358\ lb$

$1.94358\ lb=1.94358\times \dfrac{1}{2.20462}=0.88159\ kg$

The mass is 0.88159 kg

Kinetic energy is given by

$K=\dfrac{1}{2}mv^2\\\Rightarrow K=\dfrac{1}{2}0.88159\times 78.38779\\\Rightarrow K=34.55294\ J$

The kinetic energy is 34.55294 J

4 0

2 years ago

57.9 g of gold has a volume of 3 cm³ what is the density of gold in g/ centimeters cubed

Grace [21]

D=m÷v

so density would be 57.9 ÷ 3 = 19.3 g/cm³

7 0

2 years ago

Read 2 more answers

A double charged ion is accelerated to an energy of 32.0 keV by the electric field between two parallel conducting plates separa

Zanzabum

Answer:

$E=8*10^5\frac{V}{m}$

Explanation:

The magnitude of the electric field between two parallel conducting plates is defined as:

$E=\frac{\Delta V}{d}$

Here $\Delta V$ is the potential difference between the plates and d its separation.

The electric potential energy is defined as the product between the particle's charge and the potential difference:

$U=q\Delta V$

Solving for $\Delta V$ and replacing in the electric field formula:

$\Delta V=\frac{U}{q}\\E=\frac{U}{qd}$

In this case we have a double charged ion, so $q=2e$ :

$E=\frac{32*10^3eV}{(2e)(2*10^{-2}m)}\\E=8*10^5\frac{V}{m}$

6 0

2 years ago

2. 3. 4. 5. 6. 7. A(n)results when a vehicle loses part or all of its grip on the road. is a technique that can be applied when

dexar [7]

Answer:

1) Skid

2)<u> </u>Rocking

3) Oversteer situation

4) Controlled breaking

5) Overdriving headlights

6) Hydroplaning

7) Understeer situation

Explanation:

1) A <u>skid</u> results when a vehicle loses part or all of its grip on the road

2)<u> Rocking</u> is a technique that can be applied when trying to move your vehicle out of deep snow

3) The action of vehicle's rear end sliding out to a side is called an <u>oversteer situation</u>

4) <u>Controlled breaking</u> is a technique of reducing your speed as quick as possible while maintaining control of your vehicle

5) Driving at a speed where the stopping distance of your vehicle is longer than the distance you can see with your headlights is called <u>overdriving headlights</u>

6) <u>Hydroplaning</u> occurs when a tire loses road surface contact and rises on top of water

7) It is an <u>understeer situation</u> when your front tires begin to plow and your vehicle is not responding or not responding as quickly as it should, to a steering point

7 0

2 years ago