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Worksheetsامتحان جامد هيك
Total questions: 12
Worksheet time: 3hrs 0mins
A furlong is a distance of 220 yards. A fortnight is a time period of two weeks. A racehorse is running at a speed of 5.00 yards per second. What is his speed in furlongs per fortnight?
a) 27 500 furlongs/fortnight
b) 13 700 furlongs/fortnight
c) 6 220 furlongs/fortnight
d) 2 750 furlongs/fortnight
The word 'sI' in SI units stands for
Standard International
System de International
System Internationalle
Standard Integrated
A 2 000-kg sailboat experiences an eastward force of 3 000 N by the ocean tide and a wind force against its sails with the magnitude of 6 000 N directed toward the northwest (45° N of W). What is the direction of the resultant acceleration?
a. 60° N of E
b. 30° N of W
c. 30° N of E
d. 74° N of W
A thrown stone hits a window but doesn't break it. Instead, it reverses direction and ends up on the ground below the window. In this case, we know
a. the force of the stone on the glass > the force of the glass on the stone
. b. the force of the stone on the glass = the force of the glass on the stone.
c. the force of the stone on the glass < the force of the glass on the stone
d. the stone didn't slow down as it broke the glass.
. A baseball batter hits an incoming 40-m/s fastball. The ball leaves the bat at 50 m/s after a ball-on-bat contact time of 0.030 s. What is the force exerted on the 0.15-kg baseball?
a. 450 N
b. 250 N
c. 90 N
d. 50 N
An object moves in a circle. If the mass is tripled, the speed halved, and the radius unchanged, then the magnitude of the centripetal force must be multiplied by a factor of:
A. 3/2
B. 3/4
C. 9/4
D. 6
Find the tensions in the cables C and D. Set up your x and y equations where indicated and solve.
(C = 192 N, D = 285 N)
(C = 179 N, D = 265 N)
(C = 180 N, D = 367 N)
(C = 186N, D = 265 N)
3m/s2
2 m/s2
7 m/s2
5 m/s2
4 m/s2
An 800-N billboard worker stands on a 4.0-m scaffold weighing 500 N and supported by vertical ropes at each end. How far would the worker stand from one of the supporting ropes to produce a tension of 550 N in that rope?
a. 1.4 m
b. 2.0 m
c. 2.5 m
d. 2.7 m
An 80-kg man is one fourth of the way up a 10-m ladder that is resting against a smooth, frictionless wall. If the ladder has a mass of 20 kg and it makes an angle of 60° with the ground, find the force of friction of the ground on the foot of the ladder.
a. 7.8 x 102 N
b. 2.0 x 102 N
c. 50 N
d. 1.7 x 102 N
A 3.0-m rod is pivoted about its left end. A force of 6.0 N is applied perpendicular to the rod at a distance of 1.2 m from the pivot causing a ccw torque, and a force of 5.2 N is applied at the end of the rod 3.0 m from the pivot. The 5.2 N is at an angle of 30° to the rod and causes a cw torque. What is the net torque about the pivot?
a. 15 N×m
b. 0 N×m
c. -6.3 N×m
d. -0.6 N×m
A large spring requires a force of 150 N to compress it only 0.010 m. What is the spring constant of the spring?
a. 125 000 N/m
b. 15 000 N/m
c. 15 N/m
d. 1.5 N/m
