Answer:
Explanation:
Since the sled plus passenger moves with constant velocity , force applied will be equal to frictional force. Let the force applied be F
a ) Frictional force = μ R = F cosφ
R = mg - F sinφ
μ(mg - F sinφ) = F cosφ
μmg = F (μsinφ+cosφ)
F = μmg / (μsinφ+cosφ)
Work done
= F cosφ x d
= μmg x cosφ x d / (μsinφ+cosφ)
b )Work done
= 0.13 x 52.3 x 9.8 cos36.7 x 21.8 / ( 0.13 sin36.7 +cos36.7)
= 1164.61 / .87946
1324.23 J
c ) work done on the sled by friction
= - (work done by force)
= - μmg x cosφ x d / (μsinφ+cosφ)
d ) work done on the sled by friction
= - 1324.23 J
This is an example of slowing down because you encountered heavy traffic or just got tired.
Also, the numbers show acceleration.
Answer: 10.67
Explanation:
First, we needed to calculate the radius and this will be:
= Diameter / 2
= 0.900km / 2
= 0.450km
Since s = 3.00miles, we need to convert it to kilometers and this will be:
1mile = 1.6km
3 miles = 3 × 1.6km = 4.8km
Radians = s/r = 4.8/0.45 = 10.67
The formula for kinetic energy is
. Thus, the equation for velocity is
.
Oil must be mined from underground.
