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A "moving sidewalk" in an airport terminal building moves at a speed of v_0 and is of length L. A woman steps on at one end and walks at a speed v relative to the moving sidewalk.
Why is it not possible to really have a unicellular creature big enough to engulf small children and dogs?
A block with mass m = 0.35 kg is forced against a horizontal spring of negligible mass, compressing the spring a distance of 0.20 m (Fig. 7-25). When released, the block moves on a horizontal table
shows two blocks, each of mass m, suspended from the ends of a rigid weightless rod of length L1+L2 with L1 = 20 cm and L2 = 80 cm. The rod is held horizontally on the fulcrum and then released.
Every scientist that I know of maintains that it is impossible to escape the Second Law of Thermodynamics. But, if this is true, how is it possible for evolution to produce more and more complex organ
An airplane starting from airport A flies 470 km east, then 317 km at 57.3 degrees west of north, and then 492 km north to arrive finally at airport B. The next day, another plane flies directly fro
satellite is in a circular orbit about the earth (ME = 5.98 1024 kg). The period of the satellite is 3.70 104 s. What is the speed at which the satellite travels?
A sled weighing 1.0 X 10^2 N is held in place on a frictionless 20.0 degree slope by a rope attached to a stake at the top. The rope is parallel to the slope. What is the normal force of the slope
When you take your 1300-kg car out for a spin, you go around a corner of radius 60.5 m with a speed of 15.2 m/s. The coefficient of static friction between the car and the road is 0.94. Assuming you
Suppose the speakers are reconnected so that the 489 sounds they emit are exactly out of phase. At what positions are the intensity maximum and minimum now?
An airplane is flying in a horizontal circle at a speed of 100 m/s. The 80.0-kg pilot does not want her radial acceleration to exceed 7g. (a) What is the minimum radius of the circular path? (b) At
A 320 kg wooden raft floats on a lake. When a 75 kg man stands on the raft, it sinks 3.5 cm deeper into the water. When he steps off, the raft vibrates for a while. What is the frequency of the vibr
A 1.00 V potential difference is maintained across a 7.0 resistor for a period of 20.0 s. What total charge passes through the wire in this time interval?
At one instant a bicyclist is 70 m due east of a park's flagpole, going due south with a speed of 15 m/s. Then, 19 s later, the cyclist is 65 m due north of the flagpole, going due east with a spee
A steel aircraft carrier is 385 m long when moving through the icy North Atlantic at a temperature of 1.65 °C. By how much does the carrier lengthen when it is traveling in the warm Mediterrane
A state highway patrol car radar unit uses a frequency of 9.00 x 10^9. what frequency difference will the unit detect from a car receding at a speed of 46.5 m/s from stationary patrol car?
A railroad flatcar is loaded with crates. The coefficient of static friction between the crates and the floor is 0.23. If the train is moving at 45.5 km/hr, in how short a distance can the train be
A heating element of resistance (at its operating temperature) 322 Ω is connected to a battery of emf 413 V and unknown internal resistance . It is found that heat energy is being generated i
If a red cow is bred to a white bull, all offspring are roan, which have readn and white hairs intermixed on the hide. This is an example of co- dominance. What are the results of the roan x roan?
A laser beam is incident on two slits with a separation of 0.210 mm, and a screen is placed 4.90 m from the slits. If the bright interference fringes on the screen are separated by 1.56 cm, what is
What is the position vector of the particle at this time? What is the velocity of the particle when it reaches its maximum x coordinate?
How do you compare the different type of viruses, bacteria, protozoans,and helminths? How can we compare and describe their kingdom and protocols?
1) In Staphylococcus epidermidis, bacillus subtilis and escherichia coli, which one has gram- positive, which one has gram-negative? Also, which organism is the largest? which one is the smallest?
A 27 pound meteorite struck a car, leaving a dent 21 cm deep in the trunk. If the meteorite struck the car with a speed of 500 m/s, what was the magnitude of its deceleration, assuming it to be con
Explain why you can predict that meiosis gives rise to genetic differences between parents cells and daughter cells in fewer cell divisions than mitosis does?