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Consider a wooden block of density 750 kg/m3 and volume 3.0 m3. What force is required to hold it completely under water?
Consider a group of 20 molecules with the following speeds: three have speed 1 m/s, Determine the rms speed (in m/s) of the molecules in this group at this instant in time
a sphere of radius a in free space is nonuniformly charged over its surface such that the charge density, Compute the total charge of the sphere
A hoop and a disk, both of 0.86- m radius and 5.0- kg mass, are released from the top of an inclined plane 3.5 m high and 9.0 m long. What is the speed of the hoop
A patient undergoing radiation therapy for cancer receives a 230-rad dose of radiation. Assuming the cancerous growth has a mass of 0.10kg , calculate how much energy it absorbs
Describe what are the (a) magnitude and (b) direction of the boat's velocity relative to the ground? (c) How long does the boat take to cross the river?
Three resistors, 27, 49, and 79 , are connected in series, and a 0.55 A current passes through them. What is the potential difference across the three resistors
A person pushes a 20 kg shopping cart at a constant velocity for a horizontal distance of 22 m. What is the work done by the gravitational force
A 50.0 gram chunk of ice is taken from a freezer at -20 C, What is the minimum amount of stove energy required
Consider a solid that sublimes (goes from solid to gas) at 300K. In the solid phase, the molecules have six degrees of freedom and u0=-0.15 eV, What is the latent heat of sublimation in joules per mole
A cannonball shot with the initial velocity of 129 m/s at an angle of 36° follows a parabolic path and hits a balloon at the top of its trajectory. Neglect air resistance, how fast is the cannonball going as it hits the balloon.
An inclined plane with friction, a massless/frictionless pulley, and two blocks, with m1 hanging and m2 resting on the plane. How do you find the acceleration
A Hydrogen atom has one proton in the nucleus and one electron in the shell. In a classic model of the atom, What is the radius of the orbit
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