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4 years ago

1. Which areas of physics deal with the following?

Physics

2 answers:

Genrish500 [490]4 years ago

8 0

Answer:

1. how fast things move - mechanics

2. how the shape of a cave affects an echo - Sound & acoustics

3. which sunglasses are best for cutting the glare on a ski slope - optics

4. how the cooling system in a refrigerator works - thermodynamics

5. what lightning is - Electricity

6. how energy is produced by the sun – nuclear physics

Explanation:

Mechanics - the study of the motions of the objects

Sound - the study of the behavior of sound waves

Optics - the study of the behavior of light waves and optical instruments

Thermodynamics - the study of the relationship between heat and other forms of energy

Electricity - the study of properties of charges, their movement and their field interactions

Nuclear physics - study of atomic nucleus and its properties

lana66690 [7]4 years ago

5 0

ANSWER:

a. Kinematics.

b. Waves/Acoustics.

c. Optics/Polarization.

d. Thermal/Conservation of Energy.

e. Electricity and magnetism.

f. Renewable energy

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A maintenance worker wants to torque an engine bolt to 65.0 N m. If the torque wrench is 35cm in length, what is force applied t

harina [27]

Answer:

Force = 186 N

Explanation:

Torque is the rotational equivalent of linear force. It can be easely calculated using the formula :

$Torque = \vec{r} \times \vec{F}$

Where $\vec{r}$ is a vector that from the origin of the coordinate system to the point at which the force is applied (the position vector), $\vec{F}$ is the applied force.

The easiest way of computing the force is by setting the origin of the coordinate system to the lowest point of the torque wrench. By doing this we have that $r$ (the magnitud of the position vector) is 35cm.

Before computing the force we need to set all our values to the international system of units (SI). The torque is already in SI. The one missing is the length of the torque wrench (it is in centimeters and we need it in meters). So :

$35cm * \dfrac{1m}{100cm} = 0.35m$

Now using the torque formula:

$Torque = \vec{r} \times \vec{F}$

$Torque = rFsin(\theta)}$

Where $\theta$ is the smaller angle between the force and the position vector. Because the force is applied perpendiculary to the position vector $\theta = 90°$ , thus :

$Torque = rFsin(\theta)}$

$65 N m = (0.35m)Fsin(90°)}$

$F = \dfrac{65N m} {(0.35m)sin(90°)}$

$F = \dfrac{1300} {7}N$

so the force is approximately 186 N.

4 0

4 years ago

Who performed classic experiments that supported the semiconservative model of dna replication?

Salsk061 [2.6K]

Meselson and Stahl

<u>Explanation:</u>

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The classic experiment that supported the semiconservative model of dna replication was performed by Matthew Meselson and Franklin W. Stahl. In this model, the two strands of DNA unwind from each other, and each acts as a template for synthesis of a new, complementary strand. This results in two DNA molecules with one original strand and one new strand. They used E. coli bacteria as a model system.

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3 years ago

A heat pump is to be used for heating a house in winter. The house is to be maintained at 70°F at all times. When the temperatur

Anna35 [415]

Answer:

$\dot{W_{H} } = 4244.48 Btu/h$

Explanation:

Temperature of the house, $T_{H} = 70^{0} F$

Convert to rankine, $T_{H} = 70^{0}+ 460 = 530 R$

Heat is extracted at 40°F i.e $T_{L} = 40^{0}F = 40 + 460 = 500 R$

Calculate the coefficient of performance of the heat pump, COP

$COP = \frac{T_{H} }{T_{H} - T_{L} } \\COP = \frac{530 }{530 - 500 }\\ COP = \frac{530}{30} \\COP = 17.67$

The minimum power required to run the heat pump is given by the formula:

$\dot{W_{H} } = \frac{\dot{Q_{H} }}{COP} \\$ ...............(*)

Where the heat losses from the house, $\dot{Q_{H} } = 75,000 Btu/h$

Substituting these values into * above

$\dot{W_{H} } = \frac{75000}{17.67} \\ \dot{W_{H} } = 4244.48 Btu/h$

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3 years ago

Match the player positions with his or her job on the court.

velikii [3]

2.c
3.b
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......................................................................................................................................................

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3 years ago

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Which gas giant has a rotation axis so tilted that the planet rotated like a bowling ball as it orbits the sun?

Anestetic [448]

The answer to your question is OPTION B

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3 years ago