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3 years ago

Which of the following is a vector? mass time acceleration speed

Physics

2 answers:

Diano4ka-milaya [45]3 years ago

4 0

Explanation:

acceleration is a vector quantity

Radda [10]3 years ago

3 0

Answer:

acceleration is a vector quantity the explanation is below

Explanation:

Acceleration is a vector quantity. Acceleration has both magnitude and direction. For example, 9.8ms2 downward or −9.8ms2 vertically is an acceleration.

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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

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

=> $E = 0.06 V$

4 0

3 years ago

A force of 9.00 newtons acts at an angle of 19.0° to the horizontal. What is its component in the horizontal direction?

g100num [7]

It would be helpful if you draw the figure of the problem. You will see that a right triangle would be constructed by the problem where 19.0 is the angle between the hypotenuse and the base of the triangle. It is said that the force acting is said to be 9.0 N at the said angle to the horizontal. Using trigonometric relations,

cos 19 = adjacent / hypotenuse = horizontal component / 9
horizontal component = 8.51 N

5 0

3 years ago

Read 2 more answers

Think about the atmosphere of Venus. How is it different from that of other terrestrial planets?

Digiron [165]

Because one is thicker

4 0

4 years ago

Biotic factors and abiotic factor temperature

ddd [48]

Biotic is the living factors while abiotic is nonliving such as a rock

5 0

3 years ago

A 13,900 N car traveling at 40.0 km/h rounds a curve of radius 1.80 ✕ 102 m.

miss Akunina [59]

a) $0.68 m/s^2$

b) 964.5 N

c) 0.069

Explanation:

When an object is moving in a circular motion, the direction of its velocity is changing - therefore, it has an acceleration towards the center of the circle, called centripetal acceleration.

The magnitude of the centripetal acceleration is given by

$a=\frac{v^2}{r}$

where

v is the speed of the object

r is the radius of the circle

For the car in this problem:

v = 40.0 km/h = 11.1 m/s is the speed

r = 180 m is the radius of the circle

Substituting, we find the acceleration:

$a=\frac{11.1^2}{180}=0.68 m/s^2$

The centripetal force is the force that keeps the object along its circular motion. It also acts towards the center of the circle, and it is given by

$F=ma$

where

m is the mass of the object

a is the centripetal acceleration

Here the weight of the car is

$W=mg=13,900 N$

where

$g=9.8 m/s^2$ is the acceleration due to gravity

So the mass is

$m=\frac{W}{g}=\frac{13,900}{9.8}=1418.4 kg$

Therefore, the centripetal force is

$F=(1418.4)(0.68)=964.5 N$

In this case, the force of static friction between the tires and the road provides the required centripetal force to keep the car in circular motion. This force is given by:

$F_f=\mu mg$