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A box of mass 29.9 kg is subject to a horizontal applied force of 378 N, and it accelerates to the right at 10.7 m/s2. What is the net x-direction force on the box?
Two small objects of equal weight are attached to the ends of a thin weightless bar that spins about an axis perpendicular to the bar at its center. Each mass is a distance d from the axis of rotati
A 40 kg barrel is rolled up a 10 meter long ramp to a height of 5 meters. how much does the barrel weigh? how much work was done? if the person exerted an effort force of 250 newtons to roll the ba
You shoot a 58-g pebble straight up with a catapult whose spring constant is 310 N/m. The catapult is initially stretched by 0.20 m. How high above the starting point does the pebble fly? Ignore air
A ranger in a national park is driving at 32 km/h when a deer jumps onto the road 50 m ahead of the vehicle. After a reaction time of t s, the ranger applies the brakes to produce an acceleration o
Three equal point charges, each with charge 1.25mC , are placed at the vertices of an equilateral triangle whose sides are of length 0.450m . What is the electric potential energy of the system?
A child of mass 24 kg swings at the end of an elastic cord. At the bottom of the swing, the child's velocity is horizontal, and the speed is 8m/s. At this instant the cord is 3.10 m long. At this p
Two stationary positive point charges, charge 1 of magnitude 4.00nC and charge 2 of magnitude 1.95nC. What is the speed vfinal of the electron when it is 10.0 from charge 1?
A particle is in the ground state of a one-dimensional box of length 1 m. What is the minimum value of its momentum.
An observer, whose eyes are 1.88 m above the ground, is standing 29.0 m away from a tree. The ground is level, and the tree is growing perpendicular to it. The observer's line of sight with the tre
A box weighing 590 N is pushed along a horizontal floor at constant velocity with a force of 210 N parallel to the floor. What is the coefficient of kinetic friction between the box and the floor?
If a 4.0-N force is applied to the plunger and the diameters of the plunger and the needle are 1.2 cm and 2.5 mm, respectively, what force is needed to prevent fluid flow at the needle?
it is 170 cm from your eyes to your toes. you're standing 194 cm in front of a tall mirror. How far is it form your eyes to the image of your toes.
How much work is done by the electrostatic force on the moving point charge? Express your answer in joules. Use for Coulomb's constant (k= 1/4pi e0 ).
A 4.20 x 10^2 kg hot-air balloon takes off from rest at the surface of the earth. The nonconservative wind and lift forces take the balloon up, doing +9.70 x 10^4 J of work on the balloon in the pro
suddenly, a 70.0 kg parachutist makes a soft landing on the turntable at a point near the outer edge. Find the angular speed of the turntable after the parachutist lands. (Assume parachutist treated
A particle of mass 83 g and charge 89 C is released from rest when it is 89 cm from a second particle of charge -23 C. Determine the magnitude of the initial acceleration of the 83 g particle.
How fast do you have to throw the rock so that it never comes back to the asteroid and ends up traveling at a speed of 6 m/s when it is very far away? launch speed (relative to you) = 5 m/s
The force exerted by the wind on the sails of a sailboat is 460 N north. The water exerts a force of 150 N east. If the boat (including its crew) has a mass of 340 kg, what are the magnitude and dir
A potential difference of 80 mV exists between the inner and outer surfaces of a cell membrane. The inner surface is negative relative to the outer surface. How much work is required to eject a posi
A cube of ice is taken from the freezer at -8.5 degrees celsius and placed in a 95 g aluminum calorimeter filled with 310 g of water at room temperature at 20 degrees celsius. what was the mass of
Assume equilibrium conditions and that the rope is inextensible. How does the magnitude of the force exerted by the rope on the car compare to that of the force exerted by the rope on the tree?
A jet plane lands with a velocity of +103 m/s and can accelerate at a maximum rate of -5.02 m/s2 as it comes to rest. From the instant it touches the runway, what is the minimum time needed before
A power station with an efficiency of 0.5 generates 10^8 W of electric power and dissipates 1.00 10^8 W of thermal energy to the cooling water that flows through it. Knowing the specific heat of wa
A 1.4 kg object at x = 2.00 m, y = 3.10 m moves at at an angle 45° north of east. Calculate the magnitude of the object's angular momentum about the origin.