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r-ruslan [8.4K]
4 years ago
14

Two crewmen pull a raft through a lock, as shown in the figure(Figure 1). One crewman pulls with a force of 130 N at an angle of

34 ∘ relative to the forward direction of the raft. The second crewman, on the opposite side of the lock, pulls at an angle of 45 ∘ . With what force should the second crewman pull so that the net force of the two crewmen is in the forward direction?

Physics
1 answer:
sesenic [268]4 years ago
5 0

The answer & explanation for this question is given in the attachment below.

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A particular automotive wheel has an angular moment of inertia of 12 kg*m^2, and is decelerated from 135 rpm to 0 rpm in 8 secon
lozanna [386]

Answer:

(A) Torque required is 21.205 N-m

(b) Wok done will be equal to 1199.1286 j

Explanation:

We have given moment of inertia I=12kgm^2

Wheel deaccelerate from 135 rpm to 0 rpm

135 rpm = 135\times \frac{2\pi }{60}=14.1371rad/sec

Time t = 8 sec

So angular speed \omega _i=135rpm and \omega _f=0rpm

Angular acceleration is given by \alpha =\frac{\omega _f-\omega _i}{t}=\frac{0-14.1371}{8}=--1.7671rad/sec^2

Torque is given by torque \tau =I\alpha

=12\times 1.7671=21.205N-m

Work done to accelerate the vehicle is

\Delta w=K_I-K_F

\Delta W=\frac{1}{2}\times 12\times 14.137^2-\frac{1}{2}\times 12\times0^2=1199.1286J

8 0
4 years ago
What frequency is received by the ambulance after reflecting from a wall near the person watching the oncoming ambulance (as in
ElenaW [278]

Answer:

f=896Hz

Explanation:

Given data

Vs(speed of the ambulance)={(104 km/h)*(1000m*(1 h/3600)}=28.9m/s

f(frequency of the ambulance siren)=821 Hz

v(speed of sound)=345 m/s

Vo(speed of the observer)=0 m/s

To find

f(The ambulance is approaching the person)

Solution

From Doppler effect

f^{i}=(\frac{v+v_{o} }{v-v_{s} })f

As the ambulance approaches the we assign a positive sign for speed "vs" of the ambulance

So

f^{i}=(\frac{v+0}{v-(+v_{s}) } )f\\f^{i}=(\frac{v}{v-v_{s} } )f

Substitute the values from given data

f^{i}=(\frac{345m/s}{345m/s-28.9m/s} )821Hz\\f^{i}=896Hz

5 0
3 years ago
Are waves created by vibration
dezoksy [38]

Answer: yes wave are created by vibration because if there anit any vibration then the water cant move

Explanation:

8 0
3 years ago
) A cable car at a ski resort carries skiers a distance of 6.8 km. The cable which moves the car is driven by a pulley with diam
AveGali [126]

Answer:

womp

Explanation:

wompwomp

3 0
3 years ago
What will change the velocity of a periodic wave?
Travka [436]

Changing the medium of the wave.

Waves is always determined by the properties of the medium, which means that changing the medium will change the velocity of the wave


7 0
3 years ago
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