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3 years ago

10

A white-blue star is hotter than a red star. true or false

2 answers:

elena-14-01-66 [18.8K]3 years ago

5 0

A white-blue star is indeed hotter than a red star. So True :)

Dafna11 [192]3 years ago

5 0

I believe your answer is true. I hope this helped!

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What is the final velocity of a car that is originally traveling 12 m/s and then undergoes an acceleration of 2.3m/s squared for

Katarina [22]

To solve this problem we use the general kinetic equations.

We need to know the time it takes for the car to reach 130 meters.

In this way we have to:

$x(t) = x_0 + v_0t + 0.5at ^ 2$

Where

$x_0$ = initial position

$v_0$ = initial velocity

$a$ = acceleration

$t$ = time

$x(t)$ = position as a function of time

$130 = 0 + 12(t) + 0.5(2.3)t ^ 2$

$1.15t ^ 2 + 12t - 130$ .

We use the quadratic formula to solve the equation.

$t = \frac{-12 \± \sqrt {(12) ^ 2-4(1.15)(- 130)}}{2 (1.15)}$

t = 6.63 s and t = -17.1 s

We take the positive solution. This means that the car takes 6.63 s to reach 130 meters.

Then we use the following equation to find the final velocity:

$v_f = v_0 + at$

Where:

$v_f$ = final speed

$v_f = 12 +2.23(6.63)$

The final speed of the car is 27.25 m/s

3 0

4 years ago

Sin133+sin 133 value plz give answer

mamaluj [8]

Its 1.73793151243 as a whole but if rounded it is 1.74

3 0

4 years ago

A watt is a unit of<br><br>light<br>power<br>force<br>motion<br>energy

Crazy boy [7]

The answer would be Power

3 0

3 years ago

What is the cell emf for the concentrations given? Express your answer using two significant figures.

alisha [4.7K]

Complete Question

A voltaic cell is constructed with two $Zn^{2+}$ $- Zn$ electrodes. The two cell compartment have $[Zn^{2+}] = 1.6 \ M$ and $[Zn^{2+}] = 2.00*10^{-2} \ M$ respectively.

What is the cell emf for the concentrations given? Express your answer using two significant figures

Answer:

The value is $E = 0.06 V$

Explanation:

Generally from the question we are told that

The concentration of $[Zn^{2+}]$ at the cathode is $[Zn^{2+}]_a = 1.6 \ M$

The concentration of $[Zn^{2+}]$ at the anode is $[Zn^{2+}]_c = 2.00*10^{-2} \ M$

Generally the the cell emf for the concentration is mathematically represented as

$E = E^o - \frac{0.0591}{2} log\frac{[Zn^{2+}]a}{ [Zn^{2+}]c}$

Generally the $E^o$ is the standard emf of a cell, the value is 0 V

So

$E = 0 - \frac{0.0591}{2} * log[\frac{ 2.00*10^{-2}}{1.6} ]$

=> $E = 0.06 V$

4 0

3 years ago

calculate the period of a wave whose frequency is 5 Hertz and whose wavelength is one centimeter give your answer in a decimal f

olga2289 [7]

The period of the wave is the reciprocal of its frequency.

1 / (5 per second) = 0.2 second .

The wavelength is irrelevant to the period. But since you
gave it to us, we can also calculate the speed of the wave.

Wave speed = (frequency) x (wavelength)

= (5 per second) x (1cm) = 5 cm per second

4 0

4 years ago