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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.
Glutamine synthetase plays a variety of roles in bacterial metabolism.
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 ).
How many molecules of carbon dioxide (co2) are used to make 1 molecule of glucose (c6h12o6)?
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
What populations and communities are present? How dependent is your community on this ecosystem? What are the limiting factors of the ecosystem?
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.
1. What one vital function do both mitosis and meiosis perform for an organism? Explain.
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
Hydrolysis of the cake mix yields glucose, fructose, glycerol, a number of amino acids, and several kinds of molecules with long hydrocarbon chains. Further analysis shows that most of the hydrocarbon
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
Discuss the relative value, with respect to bodily homeostasis, of immovable, slightly immovable, and freely movable joints
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
Judys dietary intake provides 90 grams of protein. Her total energy intake is 2000 kcal. Approximately what percentage of her energy comes from protein
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
How are the peritubular capillaries are adapted for receiving reabsorbed substances