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lana66690 [7]
4 years ago
8

Whos on the 1 dollar bills

Physics
1 answer:
Llana [10]4 years ago
7 0

Answer:

<u> George Washington</u>

<u>Explanation:</u>

The image of the famous first President of the United States-George Washington (from  1789 to 1797) is found on every $1 bill. George Washington's image began to be found on the $1 bill in 1869.

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If the earth’s tilt on it axis were to increase by 20 degrees, what would happen to earth?
Triss [41]

Each pole would become tropical during summer, but be horribly cold during winter, far colder than they are now. But the equator would be in perpetual twilight during two seasons—and summer the opposing two.

4 0
3 years ago
A magnesium surface has a work function of 2.65 eV. Electromagnetic waves with a wavelength of 280 nm strike the surface and eje
Neko [114]

Answer:

Explanation:

Energy of radiation in eV = 1237.5/280 = 4.42 eV.

Work function = 2.65 eV.

Maximum kinetic energy = 4.42 - 2.65 = 1.77 eV.

8 0
4 years ago
What are the chemical properties of elements related to?
MAVERICK [17]
<span>The chemical properties of ANY atom are found in how they react with other elements.

A. An element's symbol - Nothing to do with reactions

B. The average atomic mass -The mass doesn't react

C. The number of electrons that occupy the outer shell - the only part of the electrons that move, SO they are involved in the reactions (answer)

D. The total number of electrons - The inner electrons cannot move from the atom unless there is ALOT of energy given to them, so these cannot react and would not contribute to the chemical properties.</span>
3 0
4 years ago
What is the number of wavelengths that pass a given point each second called?
denpristay [2]
Since waves are moving, we define frequency as the number of waves that pass a given point in a specified unit of time. The unit commonly used is Hertz which is the number of wave cycles that pass a point in one second. 
4 0
3 years ago
A parachutist of mass 56.0 kg jumps out of a balloon at a height of 1400 m and lands on the ground with a speed of 5.60 m/s. How
kirill115 [55]

Answer:

Efriction = 768.23 [kJ]

Explanation:

In order to solve this problem we must use the principle of energy conservation. Where it tells us that the energy of a system plus the work applied or performed by that system, will be equal to the energy in the final state. We have two states the initial at the time of the balloon jump and the final state when the parachutist lands.

We must identify the types of energy in each state, in the initial state there is only potential energy, since the reference level is in the ground, at the reference point the potential energy is zero. At the time of landing the parachutist will only have potential energy, since it reaches the reference level.

The friction force acts in the opposite direction to the movement, therefore it will have a negative sign.

E_{pot}-E_{friction}=E_{kin}

where:

E_{pot}=m*g*h\\E_{kin}=\frac{1}{2}*m*v^{2}

m = mass = 56 [kg]

h = elevation = 1400 [m]

v = velocity = 5.6 [m/s]

(56*9.81*1400)-E_{friction}=\frac{1}{2}*56*(5.6)^{2}\\769104 -E_{friction}= 878.08 \\E_{friction}=769104-878.08\\E_{friction}=768226[J] = 768.23 [kJ]

4 0
3 years ago
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