Answer:
Because it has more mass
Explanation:
To understand this, think about the equation of kinetic energy
KE = 
m 
Kinetic energy depends on both the velocity (v) as well as the mass (m).
Because a lorry is bigger and heavier than a car, it will have more mass. With more mass, at the same velocity the lorry with have more kinetic energy.
Two factors that can be used to evaluate health are life expectancy and quality of life
Answer:
Explanation:
Let r be the rate of the slower walker in mph
[r + (r + 1.7)](2) = 13
(2r + 1.7)(2) = 13
4r + 3.4 = 13
4r = 9.6
r = 2.4 mph
r + 1.7 = 4.1 mph
Answer:
Width = 680 [m]
Explanation:
To solve this problem we must know the speed of sound in the air, conducting an internet search, we find that this speed has a value of v = 340 [m/s].
We apply the following kinematic equation, which relates space to time, to define speed.
v = x /t
where:
x = distance [m]
t = time [s]
v = velocity [m/s]
Now replacing:
x = 340 * 4
x = 1360 [m]
But the width of the cannon is calculated when the sound wave hits the wall of the canyon, so this width is half the distance.
Width = 1360 / 2 = 680 [m]
Answer:
your friend did a work of 1717.34 J
Explanation:
The sum of the work made by your friend and you is equal the change in the kinetic energy, so:
Where 
is the work that you did, 
is the work that your friend did, m is the mass of the satellite and 
and 
are the final and initial speeds
Additionally the work that you did is equal to:
Where F and s are vectors. So, the vector s that said the displacement is calculated as:
s = <2.3, 2.6, -11.8> - <3.3, -1.6, 2.0>
s = <-1 , 4.2 , -13.8>
Therefore, is:
Then, replacing the values on initial equation and solving for , we get:
Finally, your friend did a work of 1717.34 J
