Physics Gravitation Level: High School
The Gravitational Force
The weight of an object is the same on two different planets . The mass of planet A is only twenty-five percent that of planet B . Find rA/rB , which is the ratio of the radii of the planets .
Physics Gravitation Level: High School
The Gravitational Force
A rock of mass 30 kg accidentally breaks loose from the edge of a cliff and falls straight down . The magnitude of the air resistance that opposes its downward motion is 270 N . What is the magnitude of the acceleration of the rock ?
Physics Gravitation Level: High School
The Gravitational Force
A bowing ball (mass = 7.2 kg , radius = 0.11 m ) and a billiard ball (mass = 0.32 kg, radius = 0.028 m) may each be treated as uniform spheres . What is the magnitude of the maximum gravitational force that each can exert on the other ?
Physics Force & Laws Of Motion Level: High School
The Vector Nature of Newton’s Second Law of Motion
Airplane flight recorders must be able to survive catastrophic crashes . Therefore , they are typically encased in crash-resistant steel or titanium boxes that are subjected to rigorous testing . One of the tests is an impact shock test , in which the box must survive being thrown at high speeds against a barrier . A 41 kg box is thrown at a speed of 245 m/s and is brought to a halt in a collision that lasts for a time of 5.2 ms . What is the magnitude of the average net force that acts on the box during collision ?
Physics Force & Laws Of Motion Level: High School
The Vector Nature of Newton’s Second Law of Motion
A 410 kg sailboat has an acceleration of 0.43 m/s^2 at an angle of 31 degree north of east . Find the magnitude and direction of the net force that acts on the sailboat ?
Physics Force & Laws Of Motion Level: High School
The Vector Nature of Newton’s Second Law of Motion
Two forces , F1 and F2, act on the 5.00 kg block shown in the figure at ‘click here’ . The magnitude of the force are F1 = 50.0 N and F2 = 31.0 N . What is the horizontal acceleration (magnitude and direction ) of the block ?
Physics Force & Laws Of Motion Level: High School
The Vector Nature of Newton’s Second Law of Motion
A force vector has a magnitude 630 N and a direction of 45 degree north of east . Determine the magnitude and direction of the components of the force that point along the north-south line and along the east-west line .
Physics Force & Laws Of Motion Level: High School
Newton’s First Law of Motion
A 1720 kg car is traveling with a speed of 15.0 m/s . What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 56.0 m ?
Physics Force & Laws Of Motion Level: High School
Newton’s First Law of Motion
Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit . In one test , this gun accelerates a 5.0 kg projectile from rest to a speed of 4.5 x 10^3 m/s . The net force accelerating the projectile is 5.5 x 10^5 N . How much time is required for the projectile to come up to speed ?
Physics Force & Laws Of Motion Level: High School
Newton’s First Law of Motion
A boat has a mass of 6800 kg . Its engines generate a drive force of 3850 N , due west , while the wind exert a force of 730 N , due east , and the water exerts a resistive force of 1200 N due east . what is the magnitude and direction of the boat’s acceleration ?
Physics Properties Of Matter Level: High School
An air bubble of 32.0 cm^3 is at the bottom of a lake 10.0 m deep where the temperature is 5.00 c . the bubble rises to the surface where the temp is 20.0 c . Find the volume of bubble just before it reaches the surface .
Physics Properties Of Matter Level: High School
Gases
The escape velocity from the earth is ve = 1.12*10^4 m/s . At what temperature is the rms speed equal to thid for hydrogen (h2) helium (he) nitrogen (N2) oxygen (O2) carbon dioxide CO2 and water vapor H2O from these results when can you infer about the earths atmosphere .
Physics Properties Of Matter Level: High School
Bernoulli’s law
Water is pumped through a pipe of diameter 15.0 cm from the Colorado River up to Grand Canyon Village , on the rim of the canyon . The river is at 564 m elevation and the village is at 2096 m .a) What minimum pressure must the water be pumped to arrive at the village ?
b) If 4500 m^3 are pumped per day , What is the speed of the water in the pipe ?
c) What additional pressure is necessary to deliver the flow ? (Note : You may assume that the freefall acceleration and the density of the air are constant over the given range of elevations . )
Physics Properties Of Matter Level: High School
Air is trapped above liquid ethyl alcohol in a rigid container . If the air pressure above the liquid is 1.10 atm , determine the pressure inside a bubble 4.0 m below the surface of the liquid .
Physics Heat & Thermodynamics Level: High School
A block of ice at 0 degree is added to a 150 g aluminum calorimeter cup that holds 200 g of water at 10 degree C . If all but 2.00 g of ice melt , what was the original mass of the block of ice ?