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Rzqust [24]
2 years ago
13

A ball with a volume of 3 cm3 and a density of 9.0 g/cm3 increases its velocity from 2 m/s to 6 m/s over a 12

Physics
1 answer:
V125BC [204]2 years ago
4 0

Answer:

M = ρ V = 9 gm/cm^ 3 * cm^3 = 27 gm

a = (V2 - V1) / t = (6 - 2) m/s / 12 s = 1/3 m/s^2     the acceleration

F = M a = 27 gm * 1/3 m/s^2 = 9 dynes      net force applied

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Read 2 more answers
An overnight rainstorm has caused a major roadblock. Three massive rocks of mass m1=528 kg, m2=838 kg and m3=311 kg have blocked
JulsSmile [24]

Answer:

FA=419,25N

F12=287,25N

Explanation:

The bulldozer is moving the rocks as one system, the weigth for the complete system is:

M=m1+m2+m3=1677kg

From newton´s second law the acceleration can be related to the force by:

FA=m*a=1677kg*0,250m/s^{2}=419,25N

on the middle rock we have the force F12 from the first to the middle rock on the direction of movement and F32 from the las rock to the middle rock on the opposite direction of movement.

For the last rock to accelerate at the same rate it must be subjected to a force:

F23=m3*a=311kg*0,250m/s^{2} =77,75N

This equals the force F32 on the opposite direction. the resultant force on the middle rock to mantain this acceleration should be:

F2=m2*a=838kg*0,250m/s^{2} =209,5N

The sum of all the forces applied to the middle rock is:

F2=F12-F32

Solving for F12:

F12=F2+F32=209,5N+77,75N=287,25N

3 0
3 years ago
Find the first three harmonics of a string of linear mass density 2.00 g/m and length 0.600 m when the tension in it is 50.0 n.
blsea [12.9K]

As we know that Nth harmonic of the string is given by

f = \frac{N}{2L}\sqrt{\frac{T}{m/L}}

now here we will have

m/L = mass density = 2 g/m

m/L = 0.002 kg/m

Length = L = 0.600 m

Tension = T = 50.0 N

now from above formula we have

f = \frac{N}{2(0.600)}\sqrt{\frac{50.0}{0.002}}

f = 131.8N

now for first harmonic N = 1

f_1 = 131.8 Hz

for second harmonic N = 2

f_2 = 263.5 Hz

for third harmonic N = 3

f_3 = 395.3 Hz

8 0
4 years ago
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