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3 years ago

a force of 20 N acted on a ball thereby imparting an impulse of 70 Ns to the ball. For how long did the force act on the ball?

Physics

1 answer:

Alex3 years ago

3 0

50n which would be 5 seconds?

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A rectangular coil with 50 turns of conducting wire and a total resistance of 10.0 Ω initially lies in the yz-plane at time t =

castortr0y [4]

Answer:

a) 43.20V

b) 2.71W/s

c) 40.25s

d) 7.77Nm

Explanation:

(a) The emf of a rotating coil with N turns is given by:

$emf=NBA\omega sin(\omega t)$

N: turns

B: magnitude of the magnetic field

A: area

w: angular velocity

the emf max is given by:

$emf_{max}=NBA\omega=(50)(1.80T)(0.200m*0.100m)(24.0rad/s)\\\\emf_{max}=43.20V$

(b) the maximum rate of change of the magnetic flux is given by:

$\frac{d\Phi_B}{dt}=\frac{d(A\cdot B)}{dt}=\frac{d}{dt}(ABcos\omega t)=AB\omega sin(\omega t)\\\\\frac{d\Phi_B}{dt}_{max}=(\pi(0.200*0.100))(1.80T)(24.0rad/s)=2.71\frac{W}{s}$

(c) $emf(t=0.050s)=(50)(1.80T)(0.200m*0.100m)(24rad/s)sin(24.0rad/s(0.050s))\\\\emf(t=0.050s)=40.26V$

(d) The torque is given by:

$\tau=NABIsin\theta\\\\NAB\omega=emf_{max}\\\\\tau=\frac{emf_{max}}{\omega}\frac{emf_{max}}{R}\\\\\tau=\frac{(43.20V)^2}{(24.0rad/s)(10.0\Omega)}=7.77Nm$

3 0

3 years ago

A bird flying 5.0 m overhead sees me drop it, and starts to dive straight down towards the bread the instant I release it. She c

gladu [14]

Answer:

Explanation:

muntiply the 5.0.3.0 ,you will get ans

5 0

3 years ago

Katie practiced the fuute for 45 minutes then she ate a snack for 15 minutes. next,she watched television for 30 minutes,until 6

Akimi4 [234]

Started at 4.30 p.m ,15+45+30=1 hr 30 mins,6.00-1 hr 30 mins=4.30 p.m

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4 years ago

Which is true of electricity generated both from coal and from nuclear reactions?

Fynjy0 [20]

Neither source is a renewable one.

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3 years ago

How does energy travel in a mechanical wave?

VLD [36.1K]

Answer: in a medium

Explanation:

Mechanical waves require medium to transfer energy. The medium particles vibrate about their fixed position to transfer energy. There is no transport of medium particles.

Example, sound waves are mechanical waves. The sound travels through compression and rarefaction of the medium particles.

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4 years ago