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(a) Determine the number of atoms in 1 cm3 of copper. (b) Visualize the one cubic centimeter as formed by stacking up identical cubes, with one copper atom at the center of each. Determine the volum
An object weighing 338 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 302 N. Immersed in oil, the object weighs 313 N. Calculate the density
A 550N physics students stand on a bathroom scale in an elevator. As the elevator starts moving, the scale reads 450N. (a) Find the acceleration of the elevator(magnitude and direction). (b) What is
The crate has an initial speed of 1.60 m/s. It is pulled a distance of 5.90 m. What is the change in mechanical energy of the crate? Answer in units of J and use 9.8 m/s2 for g.
Assuming that the pass was thrown at the optimal 45 ^circ angle, what was the speed at which the ball left the quarterback's hand?
Three equal point charges, each with charge 1.80micro coulombs , are placed at the vertices of an equilateral triangle whose sides are of length 0.200 . What is the electric potential energy of the
The pellet strikes the ground with a speed of 31.0 m/s. How far above the cliff edge would the pellet have gone had the gun been fired straight upward?
An electron with an initial speed of 5.50×105 is brought to rest by an electric field. What was the potential difference that stopped the electron?
An archer puts a 0.30 kg arrow to the bowstring. An average force of 402 N is exerted to draw the string back 1.3 m.
A force vector F of magnitude 2.30 N is exerted on the plunger, making medicine squirt from the needle. Determine the medicine's flow speed through the needle. Assume the pressure in the needle rema
A parachutist with a camera, both descending at a speed of 13.3 m/s, releases the camera at an altitude of 66.5 m. What is the magitude of the velocity of the camera just before it hits the ground?
An elastic cord is 65 cm long when a weight of 55 N hangs from it and is 87 cm long when a weight of 82 N hangs from it. What is the "spring" constant of this elastic cord?
What is the correct "motion camouflage" speed of approach for a dragonfly pursuing its prey at the angle 68.5 degrees. Typical speed is 0.75 m/s and 48.5 degrees
A barefoot field-goal kicker imparts a speed of 48 m/s to a football initially at rest. If the football has a mass of 0.75 kg and the time of contact with the ball is 0.013 s, what is the force exer
Earth's gravitational field is 7.66 N/kg at the altitude of the space shuttle. What is the size of the force of attraction between a student of mass 44.8 kg and Earth?
The pulling force has a magnitude of 88.4 N and is directed at an angle of 29 ° above the horizontal. Determine the coefficient of kinetic friction.
A toaster rated at 1030 W operates on a 120 V household circuit and a 4.00 m length of Nichrome wire as its heating element. The operating temperature of this element is 340°C. What is the cross
Calculate the current in the circuit 7.4 ms after the switch is closed. Assume that the capacitor is uncharged initially and that the emf of the battery is 9.0 V.
Assume that the cross section of the hose opening is circular with a radius of 1.5 centimeters.
If the astronaut throws the tool with a force of 16.0 rm N, what is the magnitude of the acceleration a of the astronaut during the throw? Assume that the total mass of the astronaut after she thro
He then turns the hubcap over, keeping it the same distance from his face. He now sees an image of his face 8.5 cm in back of it. How far is his face from the hubcap?
A 4.30 g lead bullet traveling at 370 m/s is stopped by a large tree. If half the kinetic energy of the bullet is transformed into internal energy and remains with the bullet while the other half i
A cardinal (Richmondena cardinalis) of mass 4.50×10-2 and a baseball of mass 0.150 have the same kinetic energy. What is the ratio of the cardinal's magnitude of momentum to the magnitude of
What is the particle's position at t=1.25 s if the total time the particle moves is 5.00 s and the maximum velocity is 2.00 m/s?
A potter's wheel having a radius 0.45 m and a moment of inertia 10.7 kg·m2 is rotating freely at 50 rev/min. The potter can stop the wheel in 5.0 s by pressing a wet rag against the rim and