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2 years ago

What is one advantage of doing a feild experiment instead of a lobortory expirament

Physics

1 answer:

Scrat [10]2 years ago

5 0

Answer:

- High internal validity as there is good control over all variables

- Allows for precise control over extraneous variables and IV

- Easy to replicate due to standardised procedure

you can choose one of them

hope this can help you

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A 13 cm long tendon was found to stretch 3.7 mm by a force of 12.1 N . The tendon was approximately round with an average diamet

liq [111]

Answer:

young's modulus $=\frac{stress}{strain}=\frac{0.1990\times 10^{6}}{28.46\times 10^{-3}}=6.99\times 10^6N/m^2$

Explanation:

We have given length of tendon L= 13 cm =0.13 m

Change in length $\Delta L=3.7mm=3.7\times 10^{-3}m$

Force = 12.1 N

Average diameter d =8.8 mm

So $r=\frac{d}{2}=\frac{8.8}{2}=4.4mm=4.4\times 10^{-3}m$

Area $A=\pi\times (4.4\times 10^{-3})^2=60.79\times 10^{-6}m^2$

Now stress $=\frac{force}{area}=\frac{12.1}{60.79\times 10^{-6}}=0.1990\times 10^6N/m^2$

Strain $=\frac{change\ in\ lenght}{length}=\frac{3.7\times 10^{-3}}{0.13}=28.46\times 10^{-3}$

Now young's modulus $=\frac{stress}{strain}=\frac{0.1990\times 10^{6}}{28.46\times 10^{-3}}=6.99\times 10^6N/m^2$

8 0

3 years ago

A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball

Aleksandr [31]

Answer:

the velocity (magnitude and direction) of the ball) just before the collision is $v_i = 5.144 \ m/s$

The velocity (magnitude and direction) of the ball) just after the collision is $v_f = - 1.129 \ m/s$

Explanation:

According to the law of conservation of energy;

$m__{ball}} gh = \frac{1}{2}m__{ball}}v_i^2\\\\2* m__{ball}} gh = m__{ball}}v_i^2\\\\v_i^2 = \frac{2*m_{ball}gh}{m_{ball}}\\\\v_i^2 = 2gh\\\\v_i = \sqrt{2gh} \\\\v_i = \sqrt{2*9.8*1.35}\\\\$

$v_i = 5.144 \ m/s$

Thus; the velocity (magnitude and direction) of the ball) just before the collision is $v_i = 5.144 \ m/s$

Since, Air resistance is negligible, and the collision is elastic.

The equation for the conservation of momentum and energy can be expressed as:

$v_f = [\frac{m_1 -m_2}{m_1+m_2}]v_i\\\\v_f = [\frac{m_{ball} -m_{block}}{m_{ball}+m_{block}}]v_i\\\\v_f = [\frac{1.6 -2.5}{1.6+2.5}]*5.144\\\\$

$v_f = - 1.129 \ m/s$

The velocity (magnitude and direction) of the ball) just after the collision is $v_f = - 1.129 \ m/s$

8 0

2 years ago

Which best describes protein

Elena L [17]

Answer:

It is nutrients you get from food

7 0

2 years ago

Read 2 more answers

Please help me if you know physics

Nitella [24]

Answer:

19. down

20. True

Explanation:

The examples I saw were projectiles launched at different angles and speeds. In each case, the only acceleration was ...

19: down

20: due to gravity (true)

4 0

2 years ago

When a driver touches a car’s steering wheel on a hot day, heat is transferred to the driver’s hands by ___________?

Alik [6]

The correct answer to this question is : C) Conduction

EXPLANATION:

Before coming into any conclusion, first we have to understand conduction.

Conduction is the mode of transmission of heat in which heat will flow from a body at high temperature to a body at low temperature in contact or from hotter part of the body to its colder part, without any actual transport of particles.

As per the question, the heat is transferred to driver's hand when he touches the steering wheel.

As there is actual contact between hand and steering wheel, the heat transmission will be conduction.

8 0

3 years ago

Read 2 more answers