PHYSICS HIGH SCHOOL

Which of the following is not one of da Vinci's contributions to technology?a. effect of the moon on tides
b. modern theory on the formations of the continents
c. precise observations of human anatomy
d. ideas for space travel

Answers

Answer 1
Answer:

Answer: Option d: ideas of space travel.

Explanation:

Leonardo da Vinci was an Italian. He had numerous skills in various different fields. Leonardo contributed to technology for the effect of moon on the tides,  his theory on formation of continents, human anatomy, art and much more. But he did not contribute in the ideas for space travel. Hence, the correct option is d.
Answer 2
Answer:

Answer:D

Explanation:

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____________ is the total energy of a system.a. Entropy
c. Enthalpy
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Answers

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If you want to decrease the current created by a generator what can you do?

Answers

Answer:

To decrease the current;

1) Use fewer loops or number of turns

2) Use a lower speed of rotation of the coil in the magnetic field

3) Use a weaker magnetic

Explanation:

According to Faraday's Law of induction, which is the basis of the electromagnetism, electromagnetic induction and therefore the basis of the  electric generator, can be written as follows;

\epsilon = -N \cdot (\Delta \phi)/(\Delta t)

Where;

ε = The induced voltage

N = The number of turns (loops)

ΔФ = The change in the magnetic flux

Δt = The change in the time (the duration)

Given that voltage is directly related to the current, decreasing the voltage, decreases the current

To decrease the voltage, and therefore, the current we can;

1) Reduce the number of loops in the coil

2) Increase the time change per unit change in flux by slowing down the speed of rotation of the generator

3) Decrease the amount of change in the magnetic field per turn, by using a weaker magnetic

During a laboratory experiment, a student findsthat at 20° Celsius, a 6.0-meter length of copper
wire has a resistance of 1.3 ohms. The crosssectional
area of this wire is
(1) 7.9 × 10^−8 m2 (3) 4.6 × 10^0 m2
(2) 1.1 × 10^−7 m2 (4) 1.3 × 10^7 m2

Answers

The cross-sectional area of the copper wire is which has 1.3 ohm at 20 degree Celsius during laboratory experiment by student is 7.9×10⁻⁸ ohm.

What is the resistance?

Resistance is obstacle for the current flow in the circuit. It is the measure of reverse act to current flow in through a material. It can be given as,

R=\rho(L)/(A)

Here, (ρ) is the specific resistance (l) is the length of the wire and (A) is the cross-sectional area of the wire.

During a laboratory experiment, the student finds that at 20° Celsius, a 6.0-meter length of copper wire has a resistance of 1.3 ohms.

The value of resistivity of copper wire is 1.72×10⁻⁸ ohm-m. Put these values in the above formula as,

R=\rho(L)/(A)\n1.3=1.72*10^(-8)*(6)/(A)\nA=7.9*10^(-8)\rm \; m^2

Thus, the cross-sectional area of the copper wire is which has 1.3 ohm at 20 degree Celsius during laboratory experiment by student is 7.9×10⁻⁸ ohm.

Learn more about the resistance here;

brainly.com/question/17563681

ρ = resistivity of copper at 20 °C = 1.72 x 10⁻⁸ ohm-m

R = resistance of the copper wire = 1.3 ohm

L = length of the copper wire = 6 meter

A = area of cross-section of the copper wire = ?

Resistivity of copper wire is given as

R = ρL/A

inserting the values in the above equation

1.3 = (1.72 x 10⁻⁸) (6)/A

A = 7.9 x 10⁻⁸ m²

Hence the correct choice is

(1) 7.9 x 10⁻⁸ m²

A typical land snail's speed is 12.2 meters per hour. How many miles will the snail travel in one day(24hrs)?

Answers

The snail will go 0.18193752 miles

If the speed of an object is tripled, its kinetic energy will be

Answers

If the speed of an object is tripled, its kinetic energy will be 9 times the initial value.

What is kinetic energy?

The kinetic energy of an object is the energy possessed by the object due to its motion.

K.E = ¹/₂mv²

where;

m is mass of the object

v is speed of the object

When the speed is tripled

K.E = ¹/₂m(3v)²

K.E = 9(¹/₂mv²)

Thus, if the speed of an object is tripled, its kinetic energy will be 9 times the initial value.

Learn more about kinetic energy here: brainly.com/question/25959744

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What is the frequncy of a wave that has a speed of 8m/s and a wave length of 2?

Answers

v = f \times λ

v = 8m/s

λ = 2

f = v \div λ

f = 8 \div 2

f = 4hz
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