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3 years ago

Which is not an element? Water , Arsenic, sodium, Aluminum

Physics

2 answers:

Lilit [14]3 years ago

6 0

Answer: Water

Explanation: water is a molecule and composed of Hydrogen and Oxygen atoms.

MrRa [10]3 years ago

3 0

Answer:

water

Explanation:

water is not an element, it is a molecule

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A ball is thrown upward. At a height of 10 meters above the ground, the ball has a potential energy of 50 joules (with the poten

lions [1.4K]

Answer:

h = 20 m

Explanation:

given.

height, h = 10 m

Potential energy at 10 m = 50 J

Kinetic energy at 10 m = 50 J

maximum height the ball will reach, H = ?

Total energy of the system

T E = 50 J + 50 J

T E = 100 J

now,

A h = 10 m

P E = m g h

50 = m g x 10

mg = 5 ..............(1)

at the top most Point the only Potential energy will be acting on the body.

now, TE = Potential energy

100 = m g h

5 h = 100

h = 20 m

hence, the maximum height reached by the ball is equal to 20 m.

5 0

3 years ago

A marble rolling at a speed of 2 meters per second falls off the end of a 1-meter high table. How long will the marble be in the

irga5000 [103]

t^2 = 1/4.9 
t = 0.45 sec
answer:1 - 4.9t^2 = 0

8 0

3 years ago

A straight line with a negative slope on a velocity-time graph indicates which of the following?

podryga [215]

Answer:

Explanation:

Straight line with a negative slope

On a velocity_time graph

5 0

3 years ago

Two cars, initially at rest and 5 km apart at t=0 , simultaneously move toward each other. Car A travels at a constant speed of

Anastasy [175]

Answer:

d. 268 s

Explanation:

Constant Speed Motion

An object is said to travel at constant speed if the ratio of the distance traveled by the time taken is constant.

Expressed in a simple equation, we have:

$\displaystyle v=\frac{d}{t}$

Where

v = Speed of the object

d = Distance traveled

t = Time taken to travel d.

From the equation above, we can solve for d:

d = v . t

And we can also solve it for t:

$\displaystyle t=\frac{d}{v}$

Two cars are initially separated by 5 km are approaching each other at relative speeds of 55 km/h and 12 km/h respectively. The total speed at which they are approaching is 55+12 = 67 km/h.

The time it will take for them to meet is:

$\displaystyle t=\frac{5}{67}$

t = 0.0746 hours

Converting to seconds: 0.0746*3600 = 268.56

The closest answer is d. 268 s

8 0

3 years ago

1 point

Svetllana [295]

Answer:

Beta 17,000K, bc warmer is more blue

5 0

3 years ago