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3 years ago

Element with atomic number 31

1 answer:

6 0

Gallium is a chemical element with symbol Ga and atomic number 31. Elemental gallium does not occur in free form in nature, but as the gallium(III) compounds that are in trace amounts in zinc ores and in bauxite.

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Which is a vector quantity?<br> speed<br> time<br> acceleration<br> distance

lesya692 [45]

Answer:

the quantity which has both magnitude and direction is called vector quantity

5 0

2 years ago

A straight conductor carries a current of 755 A from east to west. It is 5.80 m above the ground. Part A Find the magnitude of t

Svetach [21]

Answer:

a. 2.6*10^{-5}T

b. north to south

Explanation:

In this case you have to take into account the expression for the magnetic field generated by a current

$B=\frac{\mu_0I}{2\pi r}$

where mu0 is the magnetic permeability of vacuum, I is the current and r is the distance to the conductor in which you want to measure the field.

A) By replacing we have

$B=\frac{(4\pi *10^{-7}\frac{T}{mA})(755A)}{2\pi (5.80m)}=2.6*10^{-5}T$

B) The direction is obtained by using the right hand rule. In this case, the current is from west to east. Then the direction is from north to south

Hope this helps!!

6 0

3 years ago

What are some of the major differences between the ancient Olympics and modern-day Olympics? List and describe at least two diff

umka21 [38]

Answer:

The ancient Olympic games only allowed people of Greek descent to participate. The Salt Lake City Olympics featured 2600 athletes from 77 countries. Only a few hundred athletes participated in the ancient games.

Only men were allowed to compete in the ancient Greek games. Athletic training in ancient Greece was part of every free male citizen's education. The first women to compete in the Olympics were Marie Ohnier and Mme. Brohy. They participated in croquet games in the 1900 Olympics.

3 0

2 years ago

If the initial upward speed of the ball in Activity 7 C.2 is 10m/s, and the ball is releasedat a height of 1.5 m above the oor,

Ulleksa [173]

Answer:

6.5 m above the floor and 5 m above Christine's hand when it reaches the maximum height.

Explanation:

Let g = 10 m/s2 be the gravitational deceleration that affects the ball vertical motion so it comes to the maximum height at 0 speed. We can use the following equation of motion to find out the distance traveled by the ball from where it's thrown:

$v^2 - v_0^2 = 2g\Delta s$

where v = 0 m/s is the final velocity of the ball when it reaches maximum level, $v_0$ = 10m/s is the initial velocity of the ball when it starts, g = -10 m/s2 is the deceleration, and $\Delta s$ is the distance traveled, which we care looking for:

$0^2 - 10^2 = -2*(-10)\Delta s$

$\Delta s = 100 / (2 * 10) = 5 m$

So the ball is 5 m above Christine' hands when it reaches maximum height, and since the hand is 1.5 m above the floor, the ball is 5 + 1.5 = 6.5 m above the floor when it reaches maximum height.

5 0

2 years ago

Read 2 more answers

You apply a horizontal force of 200N against a 50kg couch. The force of friction between the couch and the floor is 180N. If the

Sergio039 [100]

Answer:

The kinetic energy gained is 40[J]

Explanation:

This is a problem that applies the work and energy conservation. We must analyze the initial and final positions as well as the forces that act on the couch during displacement.

The working and energy conservation theorem says:

$E_{k1} + W_{1-2}= E_{k2}$

The above equation tells us that kinetic energy plus the work done to move an object from one position to another will be equal to kinetic energy in the last position.

The kinetic energy in the initial position is zero since the couch is at rest, Ek1=0

The work will be given by the force that drives the couch multiplied by the distance, and the friction force that acts in the opposite direction to the displacement.

$0+(200-180)*2= Ek2\\Ek2=20*2= 40 [J]$

6 0

3 years ago