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Zinaida [17]
2 years ago
12

A person who normally weighs 580 N is riding in an elevator that is moving upward, but slowing down at a steady rate. If this pe

rson is standing on a bathroom scale inside the elevator, what would the scale read
Physics
1 answer:
Zanzabum2 years ago
5 0

Answer:

M au = Fs - M g       au = upwards acceleration; Fs = scale reading

Fs = M (au + g)    scalar quantities where g is positive downwards and au is positive upwards - Fs is the net force acting on the person

If the acceleration is zero Fs = M g  and the scale reads the persons weight

If the elevator is decelerating then au is negative and the scale reading     Fs = (g - au) M     and the scale reading is less than the weight of the person

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Jake drags a sled of mass 18 kg across the snow. The sled is attached to a rope that he pulls with a force of 70 N at an angle o
Advocard [28]
If the 30 N on the rope were pulled straight up, it would offset the force of gravity ( m g = 10 kg * 9.8 N/kg = 98 N) , leaving a net force up from the ground on the sled of 98-30 = 68 N. Since the rope is pulled at the angle of 25o, only part of the force is in the upward direction, (30N)(sin(25) = (30)(.423) = 12.7. So the net force becomes 98 N down offset by 12.7 up or 98-12.7 = 85.3 N. Ah, there it is: C.
8 0
3 years ago
Read 2 more answers
A proton is confined in an infinite square well of width 10 fm. (The nuclear potential that binds protons and neutrons in the nu
kvasek [131]

Answer:

First Question

    E   =   1.065*10^{-12} \  J

Second  Question

   The  wavelength is for an X-ray  

Explanation:

From the question we are told that

     The  width of the wall is  w =  10\ fm =  10*10^{-15 }\ m

     The  first excited state is  n_1  =  2

     The  ground state is   n_0 = 1

Gnerally the  energy (in MeV) of the photon emitted when the proton undergoes a transition is mathematically represented as

          E   =   \frac{h^2 }{ 8 * m  *  l^2 [ n_1^2 - n_0 ^2 ] }

Here  h is the Planck's constant with value  h =  6.62607015 * 10^{-34} J \cdot s

         m is the mass of proton with value m  = 1.67 * 10^{-27} \   kg

So    

          E  =   \frac{( 6.626*10^{-34})^2 }{ 8 * (1.67 *10^{-27})  *  (10 *10^{-15})^2 [ 2^2 - 1 ^2 ] }

=>        E   =   1.065*10^{-12} \  J

Generally the energy of the photon emitted is also mathematically represented as

             E  =  \frac{h * c }{ \lambda }

=>          \lambda  =  \frac{h * c }{E }

=>          \lambda  =  \frac{6.62607015 * 10^{-34} * 3.0 *10^{8} }{ 1.065 *10^{-15 } }

=>         \lambda  =  1.87*10^{-10} \  m

Generally the range of wavelength of X-ray is  10^{-8} \to  1)^{-12}

So this wavelength is for an X-ray.

     

8 0
3 years ago
A 125kg man buy a 6kg watermelon, a 3kg cantaloupe, and 6kgs of potatoes, he walks home with his purchases in a large bag. His w
Stells [14]

Answer:

350N

Explanation:

Given parameters:

Mass of the man = 125kg

Mass of the watermelon = 6kg

Mass of cantaloupe  = 3kg

Mass of potatoes  = 6kg

Acceleration  = 2.5m/s²  

Unknown:

Force required to get home  = ?

Solution:

To find this force we use;

    Force  = mass x acceleration

mass  = 125 + 6 + 3 + 6  = 140kg

 So;

      Net force = 140 x 2.5  = 350N

5 0
3 years ago
The tension of a guitar string is increased by 40%. By what factor odes the fundamental frequency of vibration change? a. 1.13 b
bogdanovich [222]

Answer:

<h3> b. 1.18</h3>

Explanation:

The fundamental frequency in string is expressed as;

F1 = 1/2L√T/m .... 1

L is the length of the string

T is the tension

m is the mass per unit length

If the tension is increased by 40%, the new tension will be;

T2 = T + 40%T

T2 = T + 0.4T

T2 = 1.4T

The new fundamental frequency will be;

F2 = 1/2L√1.4T/m ..... 2

Divide 1 by 2;

F2/F = (1/2L√1.4T/m)/1/2L√T/m)+

F2/F = √1.4T/m ÷ √T/m

F2/F = √1.4T/√m ×√m/√T

F2/F = √1.4T/√T

F2/F = 1.18√T/√T

F2/F = 1.18

F2 = 1.18F

Hence the fundamental frequency of vibration changes by a factor of 1.18

8 0
3 years ago
You turn on your car's headlights while driving at night. What transformation is taking place?
Galina-37 [17]

Answer: C.

Explanation:

7 0
3 years ago
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