Answer:
A) 29.4 m 17.0 m; B) 2 m
Explanation:
If a vector is 34.0 m in length and is directed 60.0° east of north (which means 30.0° over the horizontal), then its coordinates will be:
Horizontal: (34.0 m)cos(30.0°)=29.4 m
Vertical: (34.0 m)sin(30.0°)=17 m
If one person walks 8.0 meters in a straight line and then walks 5.0 meters in another straight line, then the minimum displacement would be to go back over his tracks, displacing himself 8m-5m=3m, while the maximum displacement would be going straight ahead, displacing himself 8m+5m=13m. Any answer outside this interval is impossible (2m).
Because you dont want other countries getting into ours, do you?
Answer:
The difference in the length of the two rods when compressed is .
Explanation:
Given that,
Length = 0.780 m
Diameter = 1.50 cm
Force = 4350 N
(a). For steel rod
We know ,
The young modulus for steel rod
Using formula of young modulus
(b). For copper rod
We know ,
The young modulus for steel rod
Using formula of young modulus
The difference in the length of the two rods when compressed is
Hence, The difference in the length of the two rods when compressed is .
Answer:
23.52 m/s
Explanation:
The following data were obtained from the question:
Time taken (t) to reach the maximum height = 2.4 s
Acceleration due to gravity (g) = 9.8 m/s²
Initial velocity (u) =..?
At the maximum height, the final velocity (v) is zero. Thus, we can obtain how fast the rock (i.e initial velocity)
was thrown as follow:
v = u – gt (since the rock is going against gravity)
0 = u – (9.8 × 2.4)
0 = u – 23.52
Collect like terms
0 + 23.52 = u
u = 23.52 m/s
Therefore, the rock was thrown at a velocity of 23.52 m/s.
<u>Answer:</u> The average kinetic energy of helium atoms is
<u>Explanation:</u>
To calculate the average kinetic energy of the atom, we use the equation:
where,
K = average kinetic energy = ?
k = Boltzmann constant =
T = temperature =
Putting values in above equation, we get:
Hence, the average kinetic energy of helium atoms is