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Will any of your readers be so kind as to inform me whether such experiments have already been tried? And, secondly, what class of seeds, or particular species, they have any reason to suppose would b
When a ceiling fan rotating with an angular speed of 2.50 is turned off, a frictional torque of 0.130 slows it to a stop in 20.5, What is the moment of inertia of the fan?
Suppose you were the first to measure the value of some physical constant experimentally. How would you provide an estimate of the experimental uncertainty?
In a popular amusement park ride, a rotating cylinder of radius 3.5 m is set in rotation at an angular speed of 5.28 rad/s, as shown. The floor then drops away, leaving the riders suspended against
A block of iron has the dimensions of 3.00 cm x 3.00 cm x 3.00 cm. It has a mass of 213 g. When placed in water, the block sinks. What volume of water did it displace?
The mass of a water molecule is 2.99 10-26 kg. If the mass of a person is 63 kg, estimate the number of water molecules in that person.
A 0.380 kg iron horseshoe that is initially at 580°C is dropped into a bucket containing 21.8 kg of water at 21.0°C. What is the final equilibrium temperature (in °C)? Neglect any heat
A plane mirror is placed on the level bottom of a swimming pool that holds water (n = 1.33) to a depth of 2.5 m. A small toy is suspended 1.9 m above the mirror. An observer above the water looks ve
A crate is pulled to the right with a force of 82 N, to the left with a force of 115 N, upward with a force of 565 N and downward with a force of 236 N. What is the magnitude and the direction of t
A string of mass density 0.0040 kg/m is under tension of 360N and is fixed at both ends. One of its resonance frequencies is 375 Hz. the next higher resonance frequency is 450 Hz. What is the funda
What will happen to the amplitude of the current in the LRC circuit when the frequency of the applied voltage is at or near the resonant frequency of the circuit.? Explain
Tarzan tries to cross a river by swinging from one bank to the other on a vine that is 10.7 m long. His speed at the bottom of the swing, just as he clears the surface of the river, is 8.7 m/s. Tar
A 70-kg man (rad=0.25m) standing on a 10-kg disc (rad=0.4m) with his arms extended (rad=0.9m) holding a 15-kg weight in each hand. What is the rotational inertia of the man with weights?
Ann is driving down a street at 53km/h. Suddenly a child runs into the street. If it takes Ann 0.709s to react and apply the brakes, how far will she have moved before she begins to slow down? Answ
What minimum horsepower must a motor have to be able to drag a 260 box along a level floor at a speed of 1.45 if the coefficient of friction is 0.50?
Draw two diagrams for the situation where a moving train (with initial speed V0) collides elastically with a target train that is not initially moving, and the trains use their springy bumpers to bo
Romeo (74.0 kg) entertains Juliet (57.0 kg) by playing his guitar from the rear of their boat at rest in still water, 3.00 m away from Juliet, who is in the front of the boat. After the serenade, J
Draw diagrams showing a situation where a bigger, moving train, vi, collides with a smaller train that is not moving. Assumer that after the collision the trains stick together.
An 63.0 N box of clothes is pulled 7.8 m up a 30.0° ramp by a force of 105 N that points along the ramp. If the coefficient of kinetic friction between the box and the ramp is 0.22, calculate t
Homologs which are heterozygous for an inversion have difficulties pairing in meiosis. During pairing homologous regions associate with one another. Consequently individual heterozygous for an inversi
How far apart are an object and an image formed by a 75 cm focal-length converging lens if the image is 2.64 X larger than the object and is real?
150 grams of boiling water (temperature 100° C, heat capacity 4.2 J/gram/K) are poured into an aluminum pan whose mass is 1000 grams and initial temperature 21° C (the heat capacity of alumi
Some good estimates about the human body can be made if it is assumed that we are made mostly of water. The mass of a water molecule is 2.99 10-26 kg. If the mass of a person is 62 kg, estimate the
Suppose a 70-kg boy and a 43-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acc
A passenger train is traveling at 32 m/s when the engineer sees a freight train 384 m ahead of his train traveling in the same direction on the same track. The freight train is moving at a speed of