Answer: 109.4 mm
Explanation: <u>Distance</u> is a scalar quantity and it is the measure of how much path there are between two locations. It can be calculated as the product of velocity and time: d = vt
The separation between the two steamrollers is 105 mm or 0.105 m. They collide to each other at the middle of the separation:
location of collision = 
= 0.0525 m
To reach that point, both steamrollers will have spent
t = 0.04375 s
The fly is travelling with speed of 2.5 m/s. So, at t = 0.04375 s:
d = 2.5*0.04375
d = 0.109375 m
Until it is crushed, the fly will have traveled 109.4 mm.
<u>Answer:</u>
<em>The average speed of the car is 66.9 km/h</em>
<u>Explanation:</u>
Here distance covered with the speed <em>57 km/h=7 km </em>
distance covered with the speed of <em>81 km/h=7 km</em>
<em>Average speed is equal to the ratio of total distance to the total time.
</em>
<em>total distance= 7 + 7= 14 km </em>
<em>
</em>
<em>time taken to cover the first 7 km= 7/57 h </em>
<em>time taken to cover the second part of the journey = 7/81 h
</em>
<em>average speed = 
</em>
<u><em>Shortcut:
</em></u>
<em>When equal distances are covered with different speeds average speed=2 ab/(a+b) where a and b are the variable speeds in the phases.
</em>
Answer:
They two waves has the same amplitude and frequency but different wavelengths.
Explanation: comparing the wave equation above with the general wave equation
y(x,t) = Asin(2Πft + 2Πx/¶)
Let ¶ be the wavelength
A is the amplitude
f is the frequency
t is the time
They two waves has the same amplitude and frequency but different wavelengths.
Answer:
A beat with the frequency of 10Hz.
Explanation:
The frequencies from the tuning fork and guitar will cancel each other.
The frequency of tuning fork = 340Hz
The frequency of guitar string= 350Hz
The offset = 350Hz - 340Hz = 10Hz
A 10Hz frequency sound is still heard.
Answer:
1. The momenta of the skaters after the shove are equal in magnitude but opposite in direction. Skater Z's mation is an ex. of recoil.
Explanation:
The moment is preserved before and after the push (impact), this is called conservation of the moment, skater x will move in the direction of the force of the push, but skater z will move in the opposite direction with a different speed, but retaining the initial moment imparted.
Recall that linear momentum is defined as the product of body mass by Velocity
P = m * v
where:
P = linear momentum [kg*m/s]
m = mass [kg]
v = velocity [m/s]
