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IrinaVladis [17]

3 years ago

12

The particles of an ice cube at 0°C (represented by the blue circles) come in contact with the particles of Juan’s hand at 37°C

(represented by the orange circles). Which diagram correctly represents the temperature of the two substances and the direction of heat flow?

2 answers:

oksano4ka [1.4K]3 years ago

6 0

Answer:

b

Explanation:

dezoksy [38]3 years ago

4 0

Answer:

its b

Explanation:

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Why do students and scientists construct scale models of natural phenomena? (1 point) Oto define new units of measurement O to c

KATRIN_1 [288]

Students and scientists construct scale models of natural phenomena to better observe patterns and relationships.

What is natural phenomena?

Things that happen naturally—phenomena—occur or show up without human intervention. Gravity, tides, moons, planets, volcanic lightning, starling swarms, ant armies, sandstorms, biological processes and oscillation, among countless more events, are examples of natural phenomena.

Scientists and students use models to help them visualize their current understanding of a system in the condition that it is in right now.

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6 0

2 years ago

How does the circuit change when the wire is added? a closed circuit occurs and makes all bulbs turn off. an open circuit occurs

Vitek1552 [10]

The circuit change when a wire is added is, an open circuit occurs and makes all bulbs turn off.

<h3>What is a closed circuit?</h3>

A closed circuit is a type of circuit connection in which the wire connection is complete and current flow occurs, turning the light bulbs on in the process.

<h3>What is an open circuit?</h3>

An open circuit is a type of circuit connection in which the wire connection is incomplete and current cannot flow, turning off the light bulbs.

Thus, the circuit change when the wire is added is, an open circuit occurs and makes all bulbs turn off.

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3 0

2 years ago

A car (mass 1200 kg, speed 100 km/h) and a truck (mass 2800 kg, speed 50 km/h) are moving in the same direction along a highway.

Sloan [31]

Answer:

Speed of the wreck after the collision is 65 km/h

Explanation:

When a car hits truck and sticks together, the collision would be totally inelastic. Since the both the vehicles locked together, they have the same final velocity.

Mass of car $m_{1}=1200 kg$

Mass of truck $m_{2}=2800 kg$

Initial speed of the car $u_{1}=100 km /h$

Initial speed of the truck $u_{2}=50 km /h$

The final velocity of the wreck will be

$m_{1}u_{1}+m_{2}u_{2}=m_{1}v_{1}+m_{2}v_{2}$

since final speed are same, $v_{1}=v_{2}=v$

$m_{1}u_{1}+m_{2}u_{2}=(m_{1}+m_{2})v$

$1200\times 100 +2800 \times 50 =(1200+2800)v\\v=\frac{260000}{4000} \\v=65 km/h$

5 0

3 years ago

. Using your knowledge of circular (centripetal) motion, derive an equation for the radius r of the circular path that electrons

Ronch [10]

Answer:

Explanation:

Magnetic field creates a force perpendicular to a moving charge in its field which is equal to Bev where B is magnetic field , e is amount of charge on the moving charge and v is the velocity of charge particle .

This force provides centripetal force for creation of circular motion. If r be the radius of the circular path

Bev = mv² / r

r = mv / Be

2 ) If an electron is accelerated by an electric field created by potential difference V then electric field

= V / d where d is distance between two points having potential difference v .

force on charged particle

electric field x charge

= V /d x e

work done by field

= force x distance

= V /d x e x d

V e

This is equal to kinetic energy created

V e = 1/2 mv²

= 1/2 m (r²B²e² / m² )

V = r²B²e/ 2 m

e / m = 2 V/ r²B²

3 )

B = $\frac{\mu\times I\times R^2}{2(R^2+Z^2)^\frac{3}{2} }$

In Helmholtz coils , distance between coil is equal to R so Z = R/2

B = $\frac{\mu\times I\times R^2}{2(R^2+\frac{R^2}{4} )^\frac{3}{2} }$

For N turns of coil and total field due to two coils

B = $\frac{\mu\times I\times N}{R\times(\frac{5}{4})^\frac{3}{2} }$

= $\frac{\mu\times I\times N}{R}\times (\frac{4}{5})^\frac{3}{2}$

= 9.0 x 10^-7 NI/R

8 0

4 years ago

What kind of energy transformations occur when you hit a coconut with a hammer?

nexus9112 [7]

It transforms into heat energy

3 0

3 years ago