Physics Work,Power & Energy Level: High School
conservation of energy
A 4.0 bullet traveling at speed of 380 m/s enters a tree and exits the other side with a speed of 180 m/g . What was the energy transferred ?
Physics Properties Of Matter Level: High School
Poisenlle's low
Poiseuilles’ law remains valid as long as the fluid is laminar . For sufficient high speed , however , the flow becomes turbulent , even if the fluid is moving through smooth pipe with no restrictions , It is found experimentally that the flow is laminar as long as the Reynolds number Re is less than about 2050 . Re = 2v delta R/0 . Here v, delta , and 0 are , respectively , the average speed , density , and viscosity of the fluid , and R is the radius of the pipe , Calculate the highest average speed that blood ( = 1060 kg/m3 , = 4.0 10-3 Pas) could have and still remain in laminar flow when it flows through the aorta (R = 7.90 10-3 m).
Physics Properties Of Matter Level: High School
Bernoulli's equation
The blood speed in a normal segment of a horizontal artery is 0.15 m/s . An abnormal segment of the artery is narrowed down by an arteriosclerotic plaque to one-fourth the normal cross-sectional area . What is the difference in blood pressures between the normal and constricted segments of the artery ?
Physics Work,Power & Energy Level: High School
A 3.30 kg object is hanging from the end of a vertical spring . The spring constant is 58.0 N/m . The object is pulled 0.200 m downward and released from rest . Complete the table at “click here” . Calculate the transactional kinetic energy , the gravitational potential energy , the elastic potential energy , the total mechanical energy E for each of the vertical position indicated . The vertical positions h indicate distances above the point of release , where h = 0 ,
Physics Properties Of Matter Level: Elementary School
Equation of continuity
he volume flow rate in an artery supplying the brain is 3.90 10-6 m^3/s .
a) If the radius of the artery is 5.40 10-3 m , determine the average blood speed .
Physics Properties Of Matter Level: High School
Archimedes principle
A paperweight , when weighed in air , has a weight of W = 7.1 N . When completely immersed in water , however , it has a weight of Win water = 4.3 N . Find the volume of the paperweight
Physics Properties Of Matter Level: High School
A paperweight , when weighed in air , has a weight of W = 7.1 N . When completely immersed in water , however , it has a weight of Win water = 4.3 N . Find the volume of the paperweight
Physics Properties Of Matter Level: High School
Pascal's law
The hydraulic oil in a car lift has a density of 8.30 102 kg/m3 . The weight of the input piston is negligible . The radii of the input piston and output plunger are 7.50 10- m and 0.125 m , respectively . What input force F is needed to support the 22500 N combined weight of a car and the output plunger under following conditions ?
a) The bottom surface of the piston and plunger are at the same level .
b) The bottom surface of the output plunger is 1.50 m above that of the input piston .
Physics Properties Of Matter Level: High School
The hydraulic oil in a car lift has a density of 8.30 102 kg/m3 . The weight of the input piston is negligible . The radii of the input piston and output plunger are 7.50 10- m and 0.125 m , respectively . What input force F is needed to support the 22500 N combined weight of a car and the output plunger under following conditions ?
a) The bottom surface of the piston and plunger are at the same level .
b) The bottom surface of the output plunger is 1.50 m above that of the input piston .
Misc Subject Misc Topic Level: Misc Level
Physics Properties Of Matter Level: High School
Two identical containers are open at the top and are connected at the bottom via a tube of negligible volume and a valve which is closed . Both containers are filled initially to the same height of 1.00 m , one with water , the other with mercury , as the drawing indicates . The valve is then opened . Water and mercury are immiscible . Determine the fluid level in the left container when equilibrium is reestablished
Question Diagram
Physics Force & Laws Of Motion Level: High School
United States currency is printed using intaglio presses that generate a printing pressure of 8.90 104 lb/in^2 . A $20 bill is 6.1 by 2.6 in. Calculate the magnitude of the force that the printing press applies to one side of the bill .
Physics Waves And Oscillations Level: High School
A 1.8 kg block is between two horizontal springs . Neither spring is strained when the block is at the position labeled x = 0 m in drawing . The left spring constant is k (left) = 430 and the right spring constant is k (right) = 655 . The block is then displaced a distance of 0.075 m from the position where x = 0 m and is released from rest .a) What is the speed of the block when it passes back through the x = 0 m position ?
b) Determine the angular frequency of this system .
Question Diagram
Physics Waves And Oscillations Level: High School
An 0.70 kg object is attached to one end of a spring , and the system is set into simple harmonic motion . The displacement x of the object as a function of times is shown in the drawing below. with the aid of the data , determine the following values .a) amplitude A of the motion
b) angular frequency T
c) spring constant k
d) speed of the object at t = 1.0 sec
e) magnitude of the object’s acceleration at t = 1.0 s .
Question Diagram
Physics Rotational Mechanics Level: High School
A 10.5 kg board is wedged into a corner and held by a spring at a 50.0 angle , as the drawing shows . The spring has a spring constant of 182 N/m and is parallel to the floor . Find the amount by which the spring is stretched from its unstrained length .
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