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The speed of an object and the direction in which it moves constitute a vector quantity known as the velocity. An ostrich is running at a speed of 20.7 m/s in a direction of 74° north of west.
A steel wire of length 1.93 m with circular cross section must stretch no more than 0.240 cm when a tensile (stretching) force of 450 N is applied to each end of the wire. What minimum diameter is r
A moth flies a distance of 3 m in only one-third of a second. What does the ratio 3/(1/3) tell you about the moth's motion? What does the (1/3)/3 tell you about the moth's motion? How far would the
If the coefficient of volume expansion of mercury is beta Hg = 1.80*10^-4/K, compute beta glass, the coefficient of volume expansion of the glass.
A cylinder contains 3.2L of oxygen at 340K and 2.6 atm . The gas is heated, causing a piston in the cylinder to move outward. The heating causes the temperature to rise to 650K and the volume of th
In the simulation above the length and orientation of the blue and yellow vectors can be changed by dragging the tips of the vectors. Given the limits available in the simulation, find the followin
If the snow is level at the foot of the incline and has the same coefficient of friction, how far will the ski travel along the level?
At some instant the velocity components of an electron moving between two charged parallel plates are vx = m/s and vy = m/s. Suppose that the electric field between the plates is given by = (125 N
A 1 megabit computer memory chip contains many 5.6 x 10-14 F capacitors. Each capacitor has a plate area of 2.4 x 10-11 m2. Determine the plate separation of such a capacitor.
In reaching her destination, a backpacker walks with an average velocity of 1.41 m/s, due west. This average velocity results, because she hikes for 5.02 km with an average velocity of 3.15 m/s due
A uniform electric field of magnitude 380 N/C pointing in the positive x-direction acts on an electron, which is initially at rest. The electron has moved 2.80 cm. (a) What is the work done by the f
The nucleus of 8Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of 2 protons and 2 neutrons). (a)
A rubber ducky falls from a bridge that is y=41.7 m above the river that passes beneath it. The ducky lands in a model boat, traveling at a constant velocity, that was x=10.9 m from the point of im
Light traveling in air is incident on the surface of a block of plastic at an angle of 72.7° to the normal and is bent so that it makes a 57.1° angle with the normal in the plastic. Find the
A golfer hits her tee-shot due north towards the fairway. Her shot has an initial velocity of 60 m/s. A 15 m/s wind is blowing in a northwesterly direction (45 degrees west of North).
What percent of the original kinetic energy of the bullet is transferred to mechanical energy of the oscillator?
A bell ringer decides to use a bowling ball to ring the bell. he hangs the 7.3kg ball from the end of a 2m long rope. He attaches another rope to the ball to pull the ball back and pulls it horizont
An object is located 9.0 cm in front of a converging lens (f = 6.0cm). Determine (a) distance of the image and (b) the height of the object (c) and the image.
If the temperature coefficient of expansion for brass is 1.9 × 10-5 (C)-1 and the temperature coefficient of expansion for aluminum is 2.4 × 10-5 (C)-1. To what temperature must both be
If this is the only possible means of cooling, how many kilograms of water per hour must be evaporated from an elephant's skin to keep it at a constant temperature?
A flask of water is connected to a vacuum pump. A fewmoments after the pump is turned on, the water begins to boil.Then, a few minutes later, the water begins to freeze. Explain what happened.
When rubidium metal is exposed to air, one Rb atom is combined with two oxygen atoms. If 1.75g of Rb is exposed to air, what is the mass of the product in grams?
Show that the quantum mechanical probability distributionapproaches the classical probability distribution as the energy of the particle approaches infinity fora fixed box length, L. Hint: it is mor
A projectile is launched from a cannon; it has an initial speed of 58 m/s at an angle of 37 degrees above horizontal. The muzzle of the cannon is 1 meters above the ground. How far down range will t
A copper block is removed from a 306 oven and dropped into 1.30 of water at 20.5. The water quickly reaches 25.9 and then remains at that temperature. What is the mass of the copper block?