1. A spring-powered launcher has a spring with a spring constant of50.0 N/cm. Th

Question

1. A spring-powered launcher has a spring with a spring constant of50.0 N/cm. The launcher is prepared to launch a projectile bycompressing the spring by 5.00 cm. If the mass of the projectile is10.0 grams, then what is the velocity of the projectile when it islaunched from the launcher?

2. A pendulum is made with a 4.00 kg mass suspended at the end of a75.0 cm thin rod. The period of the small motion simple harmonicmotion is:

3. A sound source of 100 watts radiates sound uniformly in alldirections. The intensity of the sound at a distance of 4.00 mis:

Explanation / Answer

1. Applying the law of conservation of energy we have as PE of spring=KE 1/2*k*x2=1/2*m*v2 50*0.052=0.01*v2 v2=12.5 v=3.535m/s 2. Time period T=2I/Mgl1 I=moment of inertia of rod I=Ml2/3 I=4*0.752/3=0.75kgm2 T=20.75/(4*g*0.75/2) T=1.41N 3. P=I/A A=r2=*42=50.26m2 P=100W I=100*50.26=5026Wb Hence we get by it. "Hope this helps!Best of luck for the rest of thecourework." P=100W I=100*50.26=5026Wb Hence we get by it. "Hope this helps!Best of luck for the rest of thecourework."

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