If the magnitude of F1 is greater than the magnitude of F2, then the box is
2 answers:
Answer:
Moving at constant speed in the direction of .
Explanation:
Let us consider that there are two forces acting on the box i.e
Let us assume that is acting towards left and
is acting towards right side. We know that force is a vector quantity.
If the magnitude of is than the magnitude of
, then the forces are unbalanced. Thus the box will move at constant speed in the direction of
.
Hence, the correct option is (B).
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First we need to find the speed of the dolphin sound wave in the water. We can use the following relationship between frequency and wavelength of a wave:
where
v is the wave speed
its wavelength
f its frequency
Using
and 
, we get
We know that the dolphin sound wave takes t=0.42 s to travel to the tuna and back to the dolphin. If we call L the distance between the tuna and the dolphin, the sound wave covers a distance of S=2 L in a time t=0.42 s, so we can write the basic relationship between space, time and velocity for a uniform motion as:
and since we know both v and t, we can find the distance L between the dolphin and the tuna:
where
v is the wave speed
f its frequency
Using
We know that the dolphin sound wave takes t=0.42 s to travel to the tuna and back to the dolphin. If we call L the distance between the tuna and the dolphin, the sound wave covers a distance of S=2 L in a time t=0.42 s, so we can write the basic relationship between space, time and velocity for a uniform motion as:
and since we know both v and t, we can find the distance L between the dolphin and the tuna:
Answer:
Explanation:
Given that:
the initial angular velocity
angular acceleration = 4.44 rad/s²
Using the formula:
Making t the subject of the formula:
where;
∴
t = 0.345 s
b)
Using the formula:
here;
= angular displacement
∴
Recall that:
2π rad = 1 revolution
Then;
0.264 rad = (x) revolution
x = 0.042 revolutions
c)
Here; force = 270 N
radius = 1.20 m
The torque = F * r
However;
From the moment of inertia;
given that;
I = 84.4 kg.m²
For re-tardation;
Using the equation
t = 0.398s
The required time it takes= 0.398s