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2 years ago

In the impulse approximation, __________.

Physics

1 answer:

Gwar [14]2 years ago

7 0

Answer:

(B) the external forces acting during a collision can be neglected

Explanation:

Impulse is the product of force and time for which it acts. From Newton's second law, impulse is the change in momentum. In a collision of bodies, there is a change in velocity, either in direction or magnitude. Hence, there is a change in momentum and an impulse.

The forces between the object contribute to the impulse and cannot be neglected.

Since the forces act over a time interval, they may be time-dependent. In such cases, the impulse is not a rectangular pulse (which is the graph of a time-independent force).

Impulse calculations are performed in isolated systems. Hence, external forces are neglected.

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A 5.00-g bullet is shot through a 1.00-kg wood block suspended on a string 2.00 m long. The center of mass of the block rises a

o-na [289]

Answer:395.6 m/s

Explanation:

Given

mass of bullet $m=5 gm$

mass of wood block $M=1 kg$

Length of string $L=2 m$

Center of mass rises to an height of $0.38 cm$

initial velocity of bullet $u=450 m/s$

let $v_1$ and $v_2$ be the velocity of bullet and block after collision

Conserving momentum

$mu=mv_1+Mv_2$ -------------1

Now after the collision block rises to an height of 0.38 cm

Conserving Energy for block

kinetic energy of block at bottom=Gain in Potential Energy

$\frac{Mv_2^2}{2}=Mgh_{cm}$

$v_2=\sqrt{2gh_{cm}}$

$v_2=\sqrt{2\times 9.8\times 0.38}$

$v_2=0.272 m/s$

substitute the value of $v_2$ in equation 1

$5\times 450=5\times v_1+1000\times 0.272$

$v_1=395.6 m/s$

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2 years ago

The two major problems with most motor vehicles are that they burn fossil fuels and _____________.

Citrus2011 [14]

Answer:

A. Create radioactive waste i believe

Explanation:

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2 years ago

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Find the time t1 it takes to accelerate the flywheel to ω1 if the angular acceleration is α. express your answer in terms of ω1

VMariaS [17]

T1 = ω1/α.............

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If you were to triple the size of the Earth (R = 3R⊕) and double the mass of the Earth (M = 2M⊕), how much would it change the g

EastWind [94]

Answer:

Decreased by a factor of 4.5

Explanation:

"We have Newton formula for attraction force between 2 objects with mass and a distance between them:

$F_G = G\frac{M_1M_2}{R^2}$

where $G =6.67408 × 10^{-11} m^3/kgs^2$ is the gravitational constant on Earth. $M_1, M_2$ are the masses of the object and Earth itself. and R distance between, or the Earth radius.