Two friends leave a movie theater and take different busses to the same ice cream shop. one bus takes a longer route driving on
1 answer:
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Answer:
a) 2457J
b) 558W
c) 337N
Explanation:
Assuming dogs started from rest.
and the displacement is given by:
Using the energy conservation formula:
Because the motion started from rest the initial kinetic energy is zero, the motion occurred in-ground level so the gravitational energy is zero too.
the work done by the friction force is given by:
so:
The power is given by:
and the force exerted by the dogs:
Answer:
<em>The data set marked as B has the largest standard deviation</em>
Explanation:
<u>Standard Deviation</u>
It's a number used to show how a set of measurements is spread out from the average value. A low standard deviation means that most of the values are close to the average. A high standard deviation means that the numbers are more spread out.
The formula for the standard deviation is
Where is the value of each measurement, n is the number of elements in the set, and
is the average or media of the values, defined as
Let's analyze each set of data:
A.3,4,3,4,3,4,3
The average is
Computing the stardard deviation:
B.1,6,3,15,4,12,8
The average is
Computing the stardard deviation:
C. 20, 21,23,19,19,20,20
The average is
Computing the stardard deviation:
D.12,14,13,14,12,13,12
The average is
Computing the stardard deviation:
We can see the data set marked as B has the largest standard deviation
Answer:
Explanation:
b ) The problem is based on Doppler's effect of sound
f = f₀ x (V - v₀) /( )
f is apparent frequency ,f₀ is real frequency , V is velocity of sound , v₀ is velocity of observer going away , is velocity of source going away
778 = 840 x (340 - 14)/ (340 + )
340 + = 341.18
= 1.18 m /s
it will go away from the observer or the cyclist.
speed of train = 1.18 m /s
a )
For a stationary observer v₀ = 0
f = f₀ x V /( )
= 840 x 340 / (340 + 1.180)
= 837 Hz
Answer:
The speed of disk is 1.98
Explanation:
Given:
Mass of kg
Spring constant
Compression of spring m
From energy conservation theorem,
Spring potential energy converted into kinetic energy,
Therefore, the speed of disk is 1.98