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Nat2105 [25]
3 years ago
5

A car moving at 30 m/s slows uniformly to a speed of 10 m/s in a time of 5 s. Determine 1. The acceleration of the car. 2. The d

istance it moves in the third second.
Physics
1 answer:
ValentinkaMS [17]3 years ago
8 0

Answer:

Explanation:

Initial velocity , u = 30 m/s

final velocity , v = 10 m/s

time , t = 5 seconds

1. Acceleration = v - u / t

= 10 - 30 / 5

= -20 / 5

= <u><em>- 4 m/s</em></u>

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Which measurements are equal to 321 decimeters
vlabodo [156]
You are currently converting Distance and Length units from Centimeters to Feet 321 Centimeters (cm) = 10.5315 Feet (ft) This is a hard one but see if this helps if not let me now and i can try again..
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3 years ago
When two license plates are issued they need to be attached to the _________ of the vehicle they were issued for.
Sergio039 [100]

Answer:

Front and the rear bumpers.

Explanation:

When two license plates are issued they need to be attached to the Front and the rear bumpers of the vehicle they were issued for.

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3 years ago
Solve: A car travels 2 km North , 10 km East, then 3 km West. pythagorean theorem
Evgen [1.6K]

________b_____ 7 km east

|

| 2km north.

|a

|

°

pythagorean theorem : ✓a² + b² = c²

c² = a² + b² = 4 + 49 = 53

c = ✓53 km

displacement = c = ✓53 km

distance = 10 + 3 + 2 = 15 km

5 0
3 years ago
Complete the sentences to describe the convection experiment.
riadik2000 [5.3K]

Answer:

The<u> heat transfer </u>model showed convection.

In the convection model, the red water on the bottom of the beaker <u>is hot</u>

This means that the water at the bottom of the beaker was <u> less dense than </u>the water near the top of the beaker.

Explanation:

<em>Convection</em> is the transference of heat energy by the movement (translation) of the particles of fluid (liquids or gases).

When the water on the bottom of the beaker is heated, it expands and becomes less dense.

The water near the top of the beaker is cold which makes it denser than the water at the bottom of the beaker.

Thus, the hot water from the bottom of the beaker will ascend  toward the top of the beaker, while the cold water on top will descend toward the bottom. As long, as there is a difference of temperature between the water on the bottom and on top of the beaker, there will be a continuous movement of the particles: cold particles from the top replace hot particles from the bottom that ascend, and when the cold particles are heated they will ascend and will be replaced by new cold particles. This continuous translation of hot and cold particles in fluids is the model of heat transfer by convection.

4 0
3 years ago
Read 2 more answers
A thin, uniform, metal bar, 3.00 m long and weighing 90.0 N , is hanging vertically from the ceiling by a frictionless pivot. Su
liraira [26]

Answer:

\omega_f=-2.6rad/s

Since the bar cannot translate, linear momentum is not conserved

Explanation:

By conservation of the angular momentum:

Lo = Lf

I_B*\omega_o+I_b*(V_o/d)=I_B*\omega_f+I_b*(V_f/d)

where

I_B =1/3*M_B*L^2

I_b=m_b*d^2

M_B=90/g=9kg; m_b=3kg; d=1.6m; L=3m; V_o=-10m/s; V_f=5m/s; \omega_o=0 rad/s

Solving for \omega_f:

\omega_f=m_b*d/I_B*(V_o-V_f)

Replacing the values we get:

\omega_f=-2.6rad/s

Since the bar can only rotate (it canno translate), only angular momentum is conserved.

6 0
3 years ago
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