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Vinil7 [7]
3 years ago
5

Who was the first president of America​

Physics
2 answers:
ivolga24 [154]3 years ago
5 0

Answer:George Washington

Explanation:On April 30, 1789, George Washington, standing on the balcony of Federal Hall on Wall Street in New York, took his oath of office as the first President of the United States.

polet [3.4K]3 years ago
3 0

Answer:

George Washington

Explanation:

Hope this helps out

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A helicopter lifts a 72 kg astronaut 15 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/
NemiM [27]

Answer:

a) F_H=776.952\ N

b) F_g=706.32\ N

c) v=5.4249\ m.s^{-1}

d) KE=1059.48\ J

Explanation:

Given:

  • mass of the astronaut, m=72\ kg
  • vertical displacement of the astronaut, h=15\ m
  • acceleration of the astronaut while the lift, a=\frac{g}{10} =0.981\ m.s^{-2}

a)

<u>Now the force of lift by the helicopter:</u>

Here the lift force is the resultant of the force of gravity being overcome by the force of helicopter.

F_H-F_g=m.a

where:

  • F_H= force by the helicopter
  • F_g= force of gravity

F_H=72\times 0.981+72\times9.81

F_H=776.952\ N

b)

The gravitational force on the astronaut:

F_g=m.g

F_g=72\times 9.81

F_g=706.32\ N

d)

Since the astronaut has been picked from an ocean we assume her initial velocity to be zero, u=0\ m.s^{-1}

using equation of motion:

v^2=u^2+2a.h

v^2=0^2+2\times 0.981\times 15

v=5.4249\ m.s^{-1}

c)

Hence the kinetic energy:

KE=\frac{1}{2} m.v^2

KE=0.5\times 72\times 5.4249^2

KE=1059.48\ J

8 0
3 years ago
Read 2 more answers
Which best represents the reaction of calcium and zinc carbonate (ZnCO3) to form calcium carbonate (CaCO3) and zinc? Ca → ZnCO3
Nikitich [7]

Answer:

Ca + ZnCO3 → CaCO3 + Zn

Explanation:

Ca + ZnCO₃ = CaCO₃ + Zn

Ca + ZnCO3 → CaCO3 + Zn is the answer.

Here Ca and ZnCO₃ are reactant and CaCO₃ and Zn are product . Reactants are written on the left side of equation and product are written on the right side.

8 0
3 years ago
Read 2 more answers
A rocket initially at rest accelerates at a rate of 99.0 meters/second2. Calculate the distance covered by the rocket if it atta
dezoksy [38]
Vi = 0m/s
A = 99m/s^{2}
Vf = 445m/s 
T = 4.5s 
D = ? 

D = Vi(t) + 1/2(a)(t²)
D = 0m/s ( 4.5s) + 1/2(99m/s²)(4.5s)²
D = 1002 m
D = 1 x 10³ m
6 0
3 years ago
Adding oil to a car's engine reduces _____, which means less _____ is created by moving parts rubbing together.
ss7ja [257]

Answer:

A.) friction, heat energy

Explanation:

Adding oil to something makes it slick, which in turn reduces friction, and When you reduce friction, you also reduce heat energy.

5 0
3 years ago
The effective spring constant describing the potential energy of the HBr molecule is 410 N/m and that for the NO molecule is 153
Evgen [1.6K]

Answer:

a. the minimum amplitude of vibration for the NO molecule A \simeq 4.9378 pm

b. the minimum amplitude of vibration for the HCl molecule A \simeq 10.9336 pm

Explanation:

Given that:

The effective spring constant describing the potential energy of the HBr molecule is 410 N/m

The effective spring constant describing the potential energy of the NO molecule is 1530 N/m

To calculate the minimum amplitude of vibration for the NO molecule, we use the formula:

\dfrac{1}{2}kA^2= \dfrac{1}{2}hf

kA^2= hf

A^2= \dfrac{hf}{k}

A = \sqrt{\dfrac{hf}{k}}

A = \sqrt{\dfrac{(6.626 \times 10^{-34} \ J. s ) ( 5.63 \times 10^{13} \ s^{-1})}{1530 \ N/m}}

A = \sqrt{\dfrac{3.730438 \times 10^{-20} \ m}{1530 }

A = \sqrt{2.43819477 \times 10^{-23}\ m

A =4.93780799 \times 10^{-12} \ m

A \simeq 4.9378 pm

The effective spring constant describing the potential energy of the HCl molecule is 480 N/m

To calculate the minimum amplitude using the  same formula above, we have:

A = \sqrt{\dfrac{hf}{k}}

A = \sqrt{\dfrac{(6.626 \times 10^{-34} \ J. s ) ( 8.66 \times 10^{13} \ s^{-1})}{480 \ N/m}}

A = \sqrt{\dfrac{5.738116\times 10^{-20} \ m}{480 }

A = \sqrt{1.19544083\times 10^{-22}\ m

A = 1.09336217 \times 10^{-11} \ m

A = 10.9336217 \times 10^{-12} \ m

A \simeq 10.9336 pm

3 0
3 years ago
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