Answer:
8 m³
282.3 ft³
Explanation:
The volume of each box is width times length times depth:
V = (1 m) (2 m) (1 m)
V = 2 m³
There are four boxes, so the total volume is:
4V = 8 m³
Converting to cubic feet:
8 m³ × (3.28 ft / m)³
= 282.3 ft³
Your answer is 311.29271 lbs
Answer:
t = 20s
Explanation:
In order for the police car to capture the other car, both cars must travel the same length.
The distance traveled by the first vehicle is:
S = ^ Vt = 40t, where t represents the elapsed time and V the vehicle speed.
The distance traveled by the police car is:
S = at ^ 2/2 = 2t ^ 2, where t represents the elapsed time, a is the acceleration of the car.
As the distances traveled are equal:
40t = 2t ^ 2 in this way t = 20s
Answer:
vr = 4.336 m/s
Explanation:
We are given that;
Beat frequency is 6Hz
Speed of sound = 344 m/s
Now,
Reflective Doppler frequency; f = 235 + 6 = 241 Hz
We can calculate the observed frequency if both the source sound and the observer are moving towards each other. In this case, the formula is:
f = fo[(c + vr)/(c + vs)]
Where;
ƒ = observed frequency
c = speed of sound
vs = velocity of source (negative if it’s moving toward the observer)
ƒ0 = emitted frequency of source
Since it’s moving toward the observer, thus we can rewrite equation as;
f = fo[(c + vr)/(c - vs)]
We have that;
fo = 235 , f = 241 , c = 344 , vr=vs
Thus,
241 = 235[(344+vr)/(344-vr)]
241(344 - vr)= 235(344 + vr)
82904 - 241vr = 80840 + 235vr
82904 - 80840 = 241vr + 235vr
2064 = 476 vr
vr = 2064/476
vr = 4.336 m/s
