Answer:
D
Explanation:
Speed = distance / time
her time for the first journey = 20 miles / 60 miles/hr = 1/3 hr
her time for second part of the journey = her remaining distance / her speed = (80 - 20) miles / 30 miles/hr = 60 miles / 30 miles/hr = 2 hrs
total time spend by her = 2 hr+ 1/3 hr = 2 1/3 hrs
her traveling the distance at 40 miles per hour = 80 miles / 40 miles /hr = 2 hrs
the time less she would drive if she drive the entire distance at 40 miles/hr = 2 1/3 hrs - 2 hrs = 1/3 hr
Normal force=m*g*cos theta
normal force=92kg*9.8m/s^2*cos 42
normal force=670 N
For a cylinder of mass M and radius R is released from rest at the top of an inclined plane, the expression is mathematically given as
L=MR * √{gh/3}
<h3>What is the expression for the angular momentum of the cylinder about its center of mass when it has rolled a vertical distance h.?</h3>
Generally, the equation for the angular velocity is mathematically given as
w=V/R
Therefore
In conclusion, at instance of IW, the angular velocity
L=MR * √{gh/3}
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Answer:
The minimum angle is 51.34°
Explanation:
Given that,
Weight of ladder = 100 N
Length = 8.0 m
Coefficient of static friction = 0.40
We need to calculate the normal force
Using Newtons law in vertical direction
We need to calculate the normal force
Using Newtons law in horizontal direction
We need to calculate the minimum angle
Using torque about the point A then
Put the value into the formula
Hence, The minimum angle is 51.34°
At t=0, the particle was at its equilibrium position. The time period is 32 seconds, so in 8 seconds, it will reach the extreme location once, and hence, in 8 seconds, it will cover a distance equivalent to its amplitude.