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Mechanics | Relativity
The dimension of a rectangular shape is 5.9 by 4.1mm s measured with a veneer calliper whose minimum scale is 0.05 mm. The percentage error in its surface area is approximately.
Mechanics | Relativity
A square sheat of steal has a side of 15cm at 00 C. Determine its area at 400C. (Linear expansivity of steel = 1.1x10-5 0C-1
Mechanics | Relativity
A person standing on a bridge at a height of 115 m above a river drops a 0.250-kg rock. (a) What is the rock’s mechanical energy at the time of release relative to the river surface? (b) What are the rock’s kinetic, potential, and mechanical energies after it has fallen 75.0 m? (c) Just before the rock hits the water, what are its speed and total mechanical energy?
Mechanics | Relativity
A catapult has a spring constant of 20 N/m and is pulled back 5 cm.
Calculate the initial speed of the projectile if it has a mass of 0.1 kg.
Calculate the initial speed of the projectile if it has a mass of 0.1 kg.
Mechanics | Relativity
Find the Reynolds number if a fluid of viscosity 0.4 Ns/m2 and relative density of 900 kg/m3
through a 20 mm pipe with a velocity of 2.5 m/s. Is the flow Laminar or Turbulent?
Note: If Reynolds < 2000 the flow is laminar
If Reynolds > 4000 the flow is turbulent
If 2000 < Re < 4000 it is transitional flow
Re =
through a 20 mm pipe with a velocity of 2.5 m/s. Is the flow Laminar or Turbulent?
Note: If Reynolds < 2000 the flow is laminar
If Reynolds > 4000 the flow is turbulent
If 2000 < Re < 4000 it is transitional flow
Re =
Mechanics | Relativity
A different derby car has a mass of 170 kg. If the car traveled across a 10 meter rough road before it came to a stop. How much work did the road do to stop the car? (Assume the car started with 13m/s)
Mechanics | Relativity
Why can a batter hit a pitched baseball further than a ball tossed in the air by the batter?
Mechanics | Relativity
a) Johnis riding a bicycle and comesacrossa hill of height7.30 m. At the base of the hill, he is traveling at 6.00 m/s. When he reaches the top of the hill, he is traveling at1.00 m/s. Jonathan and his bicycle together have a mass of 85.0 kg. Ignore friction in the bicycle mechanism and between the bicycle tires and the road. i)What is the total external work done on the system of Jonathan and the bicycle between the time he starts up the hill and the time he reaches the top? ii) What is the change inpotential energy stored in Jonathan’s body during this process?
Mechanics | Relativity
v=0, u=15m/s1, a=1m/s2
How much displacement and time
How much displacement and time
Mechanics | Relativity
A baseball is thrown straight upward with a speed of .
a. How long will it rise? [3]
b. How high will it rise? [3]
c. How long after it leaves the hand will it return to the starting point?[5]
a. How long will it rise? [3]
b. How high will it rise? [3]
c. How long after it leaves the hand will it return to the starting point?[5]
