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2 years ago

Who has the best answer for this

Physics

1 answer:

ioda2 years ago

6 0

Answer:

electricity because it has more percentage nd energy

Explanation:

mark me brainliest pl

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An elevator is moving downward when someone presses the emergency stop button. The elevator comes to rest a short time later. Gi

OLga [1]

Answer:

<em>Answer: - , + </em>

Explanation:

<u>Velocity and Acceleration </u>

In general terms, velocity and acceleration in the plane are both vectors with two components. They don't have 'sign' but magnitude and direction. If we know motion is restricted to a simple line, then we can define the positive and negative references.

In vertical motion, the positive reference is commonly pointed upwards, but if we chose the opposite way, the results shouldn't change in magnitude, just their signs. Let's choose like proposed, the positive direction upwards.

Since the elevator was moving downwards, its velocity is negative. When the button is pushed, it continues to move downwards, but slower. Its velocity is still negative.

The acceleration has the same sign as the velocity if it tends to increase the magnitude of the object, and is negative in the opposite case. Let's look at the formula

$\displaystyle a=\frac{v_f-v_o}{t}$

In this case, $v_f=0$ because the elevator will eventually stop, and $v_o$ is negative. It means the acceleration is

$\displaystyle a=\frac{-v_o}{t}$

It results in a positive value

$\boxed{Answer: -,+}$

Note: If we chose the opposite references, then the answer would be: +,-

5 0

3 years ago

which energy transfers are used in the electric coil of a baseboard heater? A)conduction and radiation B)convection and radiatio

Lorico [155]

conduction and radiation

6 0

4 years ago

Read 2 more answers

You find a bag labeled "10 kg of lead-210". Its contents now weigh 1.25 kg. How many half-life periods have there been since the

zlopas [31]

Answer : The number of half-life periods will be, 3

Explanation : Given,

Initial amount of lead = 10 kg

Amount of lead after decay = 1.25 kg

Half-life = 22 years

Formula used :

$a=\frac{a_o}{2^n}$

where,

a = amount of reactant left after n-half lives

$a_o$ = Initial amount of the reactant

n = number of half lives

$t_{1/2}$ = half-life

Now put all the given values in the above formula, we get:

$1.25=\frac{10}{2^n}$

$2^n=8$

$2^n=2^3$

$n=3$

Thus, the number of half-life periods will be, 3

5 0

4 years ago

What subatomic particle determines the identity of an element

FinnZ [79.3K]

Answer:

Proton

Explanation:

Proton is a subatomic particle and determines the identity of an element. each element is identified by its atomic number. In an element, the number of protons in the nuclei of the atoms of the element is same as the atomic number of that element and this number is different for each element. for example, Boron has 5 protons in its nuclei, hence the atomic number of the element is 5.

3 0

3 years ago

Find the kinetic energy of a 0.1-kilogram toy truck moving at the speed of 1.1 meters per second.

Viktor [21]

Answer:

0.061 J

Explanation:

The kinetic energy of an object is given by

$K=\frac{1}{2}mv^2$

where

m is the mass of the object

v is its speed

For the toy truck in the problem, we have

m = 0.1 kg is its mass

v = 1.1 m/s is its speed

Putting the numbers into the equation, we find

$K=\frac{1}{2}(0.1 kg)(1.1 m/s)^2=0.061 J$

6 0

4 years ago