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Mechanics | Relativity
.Three ballot boxes are connected by cords, one of which wraps over a pulley having negligible friction on its axle and negligible mass. The three masses are mA=30Kg, mB=40Kg and mC=10Kg . Determine the tension in the cord connecting B and C when the assembly was released. ii. How far does A move in the first 0.25 s (assuming it does not reach the pulley)?
Mechanics | Relativity
A support supplies a force 5 kN to a wall as shown below. What is the x component of the moment (in kN-m) produced by this force about an axis in the direction of i+j+k(from the origin)?
Mechanics | Relativity
• A 50.0 kg circus acrobat drops from a height of 2.0 m straight down onto a springboard with a force constant of 8.00 × 103 N/m. By what maximum distance does she compress the spring?
• Using energy considerations and assuming negligible air resistance, show that a rock thrown from a bridge 20.0 m above water with an initial speed of 15.0 m/s strikes the water with a speed of 24.8 m/s independent of the direction thrown.
Mechanics | Relativity
A rod of length Lo = 1m, moves with speed v equivalent to 77% of the speed of light c along the y-axis direction. At rest, the rod makes an angle of 35 ° with respect to the x- axis.
a) Determine the length of the rod as measured by a stationary observer.
b) Determine the angle θ the rod makes with the x axis when it reaches its speed.
a) Determine the length of the rod as measured by a stationary observer.
b) Determine the angle θ the rod makes with the x axis when it reaches its speed.
Mechanics | Relativity
• A 50.0 kg circus acrobat drops from a height of 2.0 m
straight down onto a springboard with a force constant of
8.00 × 103 N/m. By what maximum distance does she
compress the spring?
• Using energy considerations and assuming negligible air
resistance, show that a rock thrown from a bridge 20.0 m
above water with an initial speed of 15.0 m/s strikes the
water with a speed of 24.8 m/s independent of the direction
thrown.
straight down onto a springboard with a force constant of
8.00 × 103 N/m. By what maximum distance does she
compress the spring?
• Using energy considerations and assuming negligible air
resistance, show that a rock thrown from a bridge 20.0 m
above water with an initial speed of 15.0 m/s strikes the
water with a speed of 24.8 m/s independent of the direction
thrown.
Mechanics | Relativity
A 3kg mass with an initial velocity of 5m/s collides with and stick to a 2kg mass with an initial velocity of-3m/s .find the final velocity of the composite mass
Mechanics | Relativity
Question 1: The 8-kg ball is connected with a spring as shown. Initially the spring is compressed by 0.2 m. Then under the applied force F, the spring is stretched to 0.6 m. Determine the total work done to the ball during this process. The slope is smooth.
Mechanics | Relativity
A fisherman uses a fishing rod to pull a fish of weight 6.5 kg out of a river. The fish is then suspended vertically on the end of a fishing line of uniform circular cross section. The line has a breaking stress of 65 MPa.
Calculate:
(a)
The minimum diameter of the fishing line required if the line does not break.
(b)
The extension per metre of this line under these conditions.
Calculate:
(a)
The minimum diameter of the fishing line required if the line does not break.
(b)
The extension per metre of this line under these conditions.
Mechanics | Relativity
A rope 11m long is fastened to two hooks 9m apart on a horizontal ceiling. To the rope is attached a 400n weight so that the segments of the rope are 7m and 4m. Determine the tension in each segment.
Mechanics | Relativity
If a rope 5m long is fastened to two hooks 4m apart on a horizontal ceiling to the rope is attached a 10kg mass so that the segment of the rope is 3m and 2m. Compute the tension in each segment
