Answer:
Explanation:
We know the frequency and the velocity, both of which have good units. All we have to do is rearrange the equation and solve for 
λ
:
λ
=
v
f
Let's plug in our given values and see what we get!
λ
=
340
m
s
440
s
−
1
λ
=
0.773
m
 
        
             
        
        
        
Answer:
The magnitude of gravitational force between two masses is  .
.
Explanation:
Given that,
Mass of first lead ball, 
Mass of the other lead ball, 
The center of a large ball is separated by 0.057 m from the center of a small ball, r = 0.057 m
We need to find the magnitude of the gravitational force between the masses. It is given by the formula of the gravitational force. It is given by :

So, the magnitude of gravitational force between two masses is  . Hence, this is the required solution.
. Hence, this is the required solution.
 
        
             
        
        
        
Answer:
Stretch in the spring = 0.1643 (Approx)
Explanation:
Given:
Mass of the sled (m) = 9 kg
Acceleration of the sled (a) = 2.10 m/s
²
Spring constant (k) = 115 N/m 
Computation:
Tension force in the spring  (T) = ma
Tension force in the spring  (T) = 9 × 2.10
Tension force in the spring  (T) = 18.9 N
Tension force in the spring = Spring constant (k) × Stretch in the spring
18.9 N = 115 N  × Stretch in the spring
Stretch in the spring = 18.9 / 115
Stretch in the spring = 0.1643 (Approx)
 
        
             
        
        
        
Answer: 
D. 12 cm
Explanation: 
A node is a point on a standing wave that does not vibrate. 
The nodes of a standing wave are shown in the following sketch. 
The red dots are the nodes of the standing wave. 
It is observed that the distance between two adjacent nodes is half the wavelength of the wave. 
Therefore, if the wavelength of the wave is 24 cm, then the distance from one node to the net must be 24 / 2 = 12 cm. 
Hence, choice D is the correct answer.