Answer:
1.77 N
Explanation:
Mass of bullet m = 1.7 x 10⁻³ kg
velocity v = 380 m /s .
Momentum of one bullet
= 1.7 x 10⁻³ x 380
= 646 x 10⁻³ kg m/s
momentum of 165 bullets
= 165 x 646 x 10⁻³ kg m/s
= 106.59 kg m/s
Final momentum after bouncing
= 0
change in momentum
= 106.59 - 0
= 106.59 kg m/s
This change occurs in one minute
so rate of change in momentum
= 106.59 / 60 kg m/s per second
= 1.77 kg m/s per second
rate of change in momentum = force
This is force on superman's chest
Force required = 1.77 N .
Answer:
Option (d)
Explanation:
The electrons in a conductor moves with the drift velocity when the electric current is flowing through the conductor.
The drift velocity is due to the applied electric field across the conductor.
2Na + Cl₂ → 2NaCl
Explanation:
The reaction of sodium metal with chlorine gas to produce sodium chloride is a typical example of synthesis reaction.
Combination or synthesis involves the formation of a single product from two or more reactants.
A + B ⇒ C
In this kind of chemical reaction, a single product is formed or some compounds by the union of elements is notable.
The driving force for this category of chemical reaction is the large and negative heat of formation of the product.
learn more:
Chemical reaction brainly.com/question/3953793
#learnwithBrainly
The answer is b 12N because
We know that<span>
W = F × d × c o s(θ)</span>
assuming theta=0 we then solve and have<span>
F=<span>W/d</span></span>
substitute known values to get:<span><span>
F=<span><span>60J/</span><span>5m</span></span>=12N</span></span>
Hi there!
Initially, we have gravitational potential energy and kinetic energy. If we set the zero-line at H2 (12.0m), then the ball at the second building only has kinetic energy.
We also know there was work done on the ball by air resistance that decreased the ball's total energy.
Let's do a summation using the equations:
Our initial energy consists of both kinetic and potential energy (relative to the final height of the ball)
Our final energy, since we set the zero-line to be at H2, is just kinetic energy.
And:
The work done by air resistance is equal to the difference between the initial energy and the final energy of the soccer ball.
Therefore:
Solving for the work done by air resistance:
