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Q. A chair of weight 145.0 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 40.0 N directed at an angle of 43.0 degrees below the horizontal and the chair slides along the floor. Using Newton's laws, calculate n, the magnitude of the normal force that the floor exerts on the chair in Newton's.
Q. A small steel ball bearing with a mass of 21.0 g is on a short compressed spring. When aimed vertically and suddenly released, the spring sends the bearing to a height of 1.35 m. Calculate the horizontal distance the ball would travel if the same spring were aimed 32.0 deg from the horizontal.
A uniform-density 8 kg disk of radius 0.20 m is mounted on a nearly frictionless axle. Initially it is not spinning. A string is wrapped tightly around the disk, and you pull on the string with the constant force of 45 N through a distance of 0.7 ..
A steel aircraft carrier is 364m long when moving through the icy North Atlantic at a temperature of 2.4°C. By how much does the carrier lengthen as it is traveling in the warm Mediterranean Sea at a temperature of 21° C.
What is the minimal mass of helium (density 0.18) needed to lift a balloon carrying two people in a basket, if the total mass of people, basket, and balloon (but not gas) is 320.
An electric field of 220000 N/C points due west at a certain spot. What is the magnitude of the force that acts on a charge of -10C at the spot.
A hot ( ) lump of metal has a mass of 250g and a specific heat of 0.25 . John drops the metal into a 500g calorimeter containing 75g of water at . The calorimeter is constructed of a material that has a specific heat of 0.10 . When equilibrium is ..
What is the rate of change entropy of the first reservoir.
At what distance from a backstop will a package need to be placed depending on its weight and knowing it has to hit the backdrop at a velocity of 66 in/sec on a 11 degree angle. What is distance for every 5 lbs of package weight.
When one gallon of gasoline is burned in a car engine, 1.18 x 10^8 J of internal energy is released. Suppose that 0.99 x 10^8 J of this energy flows directly into the surroundings (engine block and exhaust system) in the form of heat. If 6.0 x 10^5 J..
Two point charges, q1= 2.40 nC and q2= -6.50 nC, are 0.100 m apart. Point A is midway between them; point B is 0.080 m from q1 and 0.060 m from q2 (see the attachment). Take the electric potential to be zero at infinity.
When verticaly falling sand hits a horizontally moving cart, the cart slows. avoid any friction between the cart and the tracks. Give two reason for this, one in terms of a horizontal force acting on the cart, and one terms of momentum conservatio..
And if the plane could fly without this pilot, how much force would the plane require to maintain the equal acceleration?
A projectile is fired at an upward angle of 45° from the top of a 308m cliff with a speed of 198 m/s. What will be its speed while it strikes the ground below? (Use conservation of energy.)
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