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Are humans subject to the same pressures of natural selection as other organisms? Why or Why not?
Describe the mechanisms by which the kidneys remove hydrogen ions from the body.
A river has a steady speed of 0.500 m/s.A student swims upstream a distane of 1.00 km and swims back to the starting point. If the student can swim at a speed of 1.20 m/s in still water, how long d
The charge is uniformly distributed within the volume of each sphere. What is the magnitude E of the electric field midway between the spheres?
A space station, in the form of a wheel 194 m in diameter, rotates to provide an "artificial gravity" of 7.4 m/s2 for persons who walk around on the outer rim. Find the rotational frequency of the
An electronic device requires a power of 16 W when connected to a 15.0 V battery. How much power is delivered to the device if it is connected to a 11.0 V battery? (Neglect the resistances of the b
A force of 12.7 N acts horizontally on a 21.7-kg mass that is at rest on a smooth table. Find acceleration
A woman of mass m =82 kg rides in a elevator of mass M = 4078 kg. The elevator is pulled by a cable, and the woman is standing on a scale (of negligible mass).
What is the magnitude of the electric field at P1? Hint: The direction of the dipole vector ˆp is from the negative charge to the positive charge. Answer in units of N/C.
A circular loop in the plane of the screen lies in a 0.87 T magnetic field pointing into the screen. If the loop's diameter changes from 19.5 cm to 6.0 cm in 0.50 s, determine the following.
A plane leaves the airport in Galisto and flies 175 km at 68.0^circ east of north and then changes direction to fly 260 km at 48.0^circ south of east, after which it makes an immediate emergency la
Alex pulls with force of magnitude 206 N, and Charles pulls with force of magnitude 163 N. Note that the direction of Charles' force is not given. What is the magnitude of Betty's force?
A proton moves with a speed of 4700000 m/s horizontally, at a right angle to a magnetic field. What magnetic field strength is required to just balance the weight of the proton and keep it moving ho
A motorist drives south at 30.0 m/s for 3.00 min, then turns west and travels at 25.0 m/s for 2.80 min, and finally travels northwest at 30.0 m/s for 1.00 min. For this 6.80 min trip. how do you fi
A 800-turn solenoid, 21 cm long, has a diameter of 2.1 cm. A 10-turn coil is wound tightly around the center of the solenoid.If the current in the solenoid increases uniformly from 0 to 3.7 A in 0.2
A sled is pulled with a horizontal force of 17 N along a level trail, and the acceleration is found to be 0.36 m/s2. An extra mass m = 4.4 kg is placed on the sled. If the same force is just barely
A woman rides a carnival Ferris wheel at radius 16 m, completing 4.4 turns about its horizontal axis every minute. What are (a) the period of the motion, and the magnitude of her centripetal accele
An infinite line of charge has linear charge density 5.50 10-12 C/m. A proton (mass 1.67 10-27 kg, charge +1.60 10-19 C) is 18.0 cm from the line and moving directly toward the line at 1.20 103 m/s.
A spelunker (cave explorer) drops a stone from rest into a hole. The speed of sound is 343 m/s in air, and the sound of the stone striking the bottom is heard 1.50 s after the stone is dropped. How
A planet of mass 7 × 1024 kg is at location ‹ -5 × 1011, 7 × 1011, 0 › m. A star of mass 8 × 1030 kg is at location ‹ 4 × 1011, -5 × 1011, 0
A circular surface with a radius of 0.067 m is exposed to a uniform electric field of magnitude 1.92 x 104 N/C. The electric flux through the surface is 56 N·m2/C. What is the angle between
a circuit contains six 240 ohm lamps, 60 w bulbs, and a 10 ohm heater sonnected in parallel. the voltage across the curcuit is 120 v. what is the current in the circuit .
In an ultra-high-vacuum system, the pressure is measured to be 1.00 X 10-10 torr (where 1 torr = 133 Pa). Assuming the molecular diameter is 3.00 % 10-10 m, the average molecular speed is 500 m/s, a
What should be the spring constant k of a spring designed to bring a 1500 {rm kg} car to rest from a speed of 90 {rm km/h} so that the occupants undergo a maximum acceleration of 5.0g?
You measure the mass of a physics textbook to be 3.20±0.07 kg, and use this value to estimate the total mass of 700 identical physics textbooks in the bookstore. What is the absolute uncerta