Answer:
B. 85.4 N
Explanation:
The tension in the rope at the lowest point of the motion of the ball is antiparallel to the weight of the ball. By Newton's laws we construct the following equation of equilibrium:
(1)
Where:
- Tension in the rope, measured in newtons.
- Weight, measured in newtons.
- Gravitational acceleration, measured in meters per square second.
- Speed of the ball, measured in meters per second.
- Length of the rope, measured in meters.
If we know that , , and , then the tension in the rope at this point is:
Hence, the correct answer is B.
Answer:
a.) magnitude __49.7__ unit(s)
b.) direction __123.6°_ counterclockwise from the +x axis
Explanation:
Let Vector is v
x-component of Vector v = x = -27.5 units (minus sign indicate that x-component is along the minus x-axis )
y-component of Vector v = y = 41.4 units
Magnitude of v = ?
Direction of v = ?
To find the magnitude of the vector
v =
v =
v = 49.7 units
To find direction
θ = tan⁻¹(y/x)
θ = tan⁻¹(41.4/-27.5)
θ = -56.4°
This Angle is in the clockwise direction with respect to -x axis.
We need to find Angle counterclockwise from the +x axis.
So,
θ = 180° - 56.4°
θ = 123.6°
The given vector is in 2nd quadrant
Answer:
Sample size determination
Explanation:
Sample size determination is the process of determining the number of observations to be used in a research hypothesis.
The larger the sample size, the more precise and accurate the results of the hypothesis will be. Bearing this in mind, the researcher will prefer to place a greater value on the research project with 10,000 participants.
Answer
given,
length of the swing = 26.2 m
inclined at an angle = 28°
let, the initial height of the Tarzan be h
h = L (1 - cos θ)
a) initial velocity v₁ = 0 m/s
final velocity of Tarzan = v_f
law of conservation of energy
PE_i + KE_i = PE_f + KE_f
= 7.75 m/s
the speed tarzan at the bottom of the swing
v_f = 7.75 m/s
b)initial speed of the = 3 m/s
v_f= 11.29 m/s
Not sure what this has anything to do with physics but in my opinion most do it to teach them a lesson not to do something again others take there anger on their kids e.g if they are drunk and some take pleasure in hitting their kids for no apparent reason.