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In a particular region of Earth's atmosphere, the electric field above Earth's surface has been measured to be 140 N/C downward at an altitude of 240 m and 167 N/C downward at an altitude of 390 m.
How many excess electrons make up this charge? What is the percentage of the mass of these excess electrons to the mass of the penny?
A 95.0-kg fullback moving south with a speed of 5.0 m/s has a perfectly inelastic collision with a 90.0 kg opponent running directly at him with a speed of 3 m/s. Calculate the decrease in total en
Determine the maximum fraction [moff/mtotal] that can hang over the edge without causing the whole washcloth to slide off the table.
What is Tension in the chain at the point where the chain is attached to the block? What ia the tension of the chain midway up the chain. And Determine the tension in the chain at the point where th
What is the angle when he releases the rope? What is the tension in the rope just before he releases it?What is the maximum tension in the rope?
A 52 kg person escapes from a burning building by jumping from a window 50 m above a catching net. Assuming that air resistance exerts a 95 N force on the person during the fall, determine the pers
A man swings his child in a circle of radius .75 meters. if the mass of the child is 25 kilograms and the child makes one revolution in 1.5 seconds, what is the magnitude and direction of the force
Consider a one-dimensional elastic collision between a moving object A and an object B initially at rest. How would you choose the mass of B, in comparison to the mass of A, in order that B should
The mass then travels vertically and it takes 1.10 s for the mass to reach the top of its trajectory. Calculate the spring constant, in N/m. (Use g=9.81 m/s2). Assume that the time required for the
What is the wavelength of light whose first-order maxima will be 17.4 {rm cm} from the central maximum on the screen?
On the screen the location nearest the central maximum where the intensity is zero is found to be 1.5 cm from this central point. What is the distance to the screen?
Current LST at the launch site is 1130. a. How many launch opportunities will there be per day? b. What is the launch window location angle for both opportunities? c. What is LWSTAN? d. How long un
Find the wavelenght of the ultrasonic wave emitted by a bat if it has a frequency of 4.0*10^4 Hz.
An observer B moving relative to observer A finds that the rocket is moving with a velocity of 0.922c to the left. What is the velocity of observer B relative to observer A?
10m at the left where the care runs out of gas and 15 m at thr right were it is headed. What will be the car's speed as it coasts into the gas station on the other side of the valley?
Find the rate of the wheel's rotation in revolutions per minute that will produce this effect.
A satellite has the following position and velocity vectors: R vector = 5016I^ + 5520J^ + 853K^ (km) V vector = 0.25I^ - 0.77J^ - 6.12K^ (km/s) a. What is the specific angular momentum of the satel
A block of mass 0.21 kg is placed on a vertical spring of constant 6125 N/m and pushed downward, compressing the spring 0.11 m. After the block is released it leaves the spring and continues to tra
A 20-turn coil, with a resistance 8 ohms and area of 0.01 m2, is in a magnetic field of 1.5T, perpendicular to the coil's plane. If the magnetic field is change steadily to 3 T in 5 s, find the ind
Take the density of wood to be 0.657g/cm3, and the density of steel to be 7.838g/cm3. For water, the density is 1.00×103 kg/m3 (or 1.00 g/cm3).
Compare and contrast pigment color with the color seen from a light. Prepare a 300-350 word referenced essay that clearly differentiates between mixing pigment colors and mixing light colors.
A 73 kg parachutist descends through a vertical height of 410 m with constant speed. Find the increase in entropy produced by the parachutist, assuming the air temperature is 21°C.
What are the boiling point and freezing point of a 3.01m solution of naphthalene in benzene?
A ball tied to the end of a string is swung in a vertical arc of radius r under the the action of gravity. what will be the tension in the string at the highest point and when the ball is at the lo