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3 years ago

5

which of the following materials is a conductor of electric current,1=wooden spoon 2=a copper penny 3=a plastic game piece 4=a g

lass window

1 answer:

san4es73 [151]3 years ago

7 0

It is the copper penny as it is metal and wood, plastic, and glass do not conduct electricity.

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An object starts from rest at the origin (x0 = 0) and travels in a straight line with a constant acceleration (a = constant). Su

agasfer [191]

Answer:

$a=(6.8)\ m/s^2$

Explanation:

Given that,

An object starts from rest at the origin (x₀ = 0) and travels in a straight line with a constant acceleration (a = constant).

The relation between the position (x) and time (t) is given by :

$x=(3.4t^2)\ m/s^2$

Let v is the velocity of the object.

$v=\dfrac{dx}{dt}$

$v=\dfrac{d(3.4t^2)}{dt}$

$v=(6.8t)\ m/s$

Let a is the acceleration of the object. It is given by :

$a=\dfrac{dv}{dt}$

$a=\dfrac{d(6.8t)}{dt}$

$a=(6.8)\ m/s^2$

So, the acceleration of the object is $(6.8)\ m/s^2$ . Hence, this is the required solution.

4 0

3 years ago

Plants make ___________ using carbon dioxide, water and energy from the sun.

gizmo_the_mogwai [7]

Answer:

I think it's carbohydrates

Explanation:

The energy from light causes a chemical reaction that breaks down the molecules of carbon dioxide and water and reorganizes them to make the sugar (glucose) and oxygen gas.

7 0

3 years ago

What can cause a big city to be warmer than the surrounding countryside?

hammer [34]

There are many people in the city and so much traffic that it pollutes the air and makes it warmer where the country dosent have much traffic so there for its cooler

4 0

3 years ago

Read 2 more answers

The greater the force exerted by the engine of a car over a set distance, the greater the change in ?

aleksandrvk [35]

The greater the change in velocity, or speed.

8 0

4 years ago

A river flows with a uniform velocity vr. A person in a motorboat travels 1.22 km upstream, at which time she passes a log float

storchak [24]

Answer:

t ’= $\frac{1450}{0.6499 + 2 v_r}$ , v_r = 1 m/s t ’= 547.19 s

Explanation:

This is a relative velocity exercise in a dimesion, since the river and the boat are going in the same direction.

By the time the boat goes up the river

v_b - v_r = d / t

By the time the boat goes down the river

v_b + v_r = d '/ t'

let's subtract the equations

2 v_r = d ’/ t’ - d / t

d ’/ t’ = 2v_r + d / t

$t' = \frac{d'}{ \frac{d}{t}+ 2 v_r }$

In the exercise they tell us

d = 1.22 +1.45 = 2.67 km= 2.67 10³ m

d ’= 1.45 km= 1.45 1.³ m

at time t = 69.1 min (60 s / 1min) = 4146 s

the speed of river is v_r

t ’= $\frac{1.45 \ 10^3}{ \frac{ 2670}{4146} \ + 2 \ v_r}$

t ’= $\frac{1450}{0.6499 + 2 v_r}$

In order to complete the calculation, we must assume a river speed

v_r = 1 m / s

let's calculate

t ’= $\frac{ 1450}{ 0.6499 + 2 \ 1}$

t ’= 547.19 s

8 0

3 years ago