Answer:
0J
Option: B
Explanation:
Work is done when something is moved by the force in the direction of the force. That is the force (e.g., the weight) and the direction the object moves must be aligned for work to be done. In this given condition, the direction is horizontal and the force is downward as its gravity force. That 90° between the two vectors.
The work function is W = m × g ×h × cosθ
Hence,
Work done = 7 × 9.8 × 1.5 × cos(90)
Work done = 0 (cos
= 0)
Work done = 0
Therefore work done is 0 J.
Answer: work = 1,305kJ
Explanation:
angle= 30°
force= 1,500N
distance= 1,000m
The formula for work is : Work= force x distance, however there is an angle of 30° between the direction of force applied and the direction of motion, therefore force must be decomposed to its value on the horizontal axis which is the direction of motion by using the cosine of the very angle.
W= F×cos(α)×D
W= 1,500×cos (30)×1,000
W= 1,305kJ ( kilojoules)
Sports like swimming and track are individual races but in the end everyone on the team races come together to make a team placement.
Power = (voltage) x (current)
IF it's using the full 18 watts of power right now, then . . .
18 W = (6 V) x (current)
Current = (18 W) / (6 V)
<em>Current = 3 Amperes</em>
Answer:
The required acceleration is 
m/s²
Explanation:
Given
To determine
Acceleration a = ?
We know that acceleration is produced when a force is applied to a body.
The acceleration can be determined using the formula
where
now substituting F = 250 , and m = 221 in the formula
switch the equation
Divide both sides by 221
simplify
m/s²
Therefore, the required acceleration is m/s²
