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A piece of wire with mass per unit length 88 runs horizontally at right angles to a horizontal magnetic field. A 5.7 current in the wire results in its being suspended against gravity. What is the m
A scientist extracted 4.6 picograms of DNA from mouse muscle cells. How much DNA could be extracted from the same number of mosue kidney cells and the same number of mouse sperm
At one instant, it moves through the point at coordinates (4.00 m, 4.00 m) with a velocity of -5.00 m/s and an acceleration of +11.5 m/s2.
An object weighing 349 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 312 N. Immersed in oil, the object weighs 324 N. Calculate the density
Does the formula for the potential energy U = m g h apply for objects far away from the Earth (like the moon)? Why or why not?
For a damped oscillator with a mass of 160 g, a spring constant 80 N/m and a damping coefficient of 70 g/s, what is the ratio of the amplitude of the damped oscillations to the initial amplitude at
Suppose that a positron traveling at a speed of 0.95c collides head on with an electron traveling at the same speed. What is the sum of the energies of the two photons which are produced when the posi
A playground merry-go-round of radius R = 1.60 m has a moment of inertia I = 250 kg·m2 and is rotating at 11.0 rev/min about a frictionless vertical axle. Facing the axle, a 25.0 kg child hop
Explain the relationships between mitosis in eukaryotic cells and binary fission in prokaryotes
Three equal point charges, each with charge 1.65 mu C, are placed at the vertices of an equilateral triangle whose sides are of length 0.200 m. What is the electric potential energy U of the system?
An amateur horse breeder has acquired four new bay-coloured mares (females horses) with uncertain pedigree. What are the possible genotypes of the mares purchased
A second package is thrown downward from the plane with a vertical speed v1 = 61 m/s. What is the magnitude of the total velocity of the package at the moment it is thrown as seen by an observer on
Stata three examples of human activities that could endanger Botana Curus
Why doesn't Earth get hot enough to boil oceans and melt rocks from the radiant energy it absorbs from the Sun?
Testosterone and estradiol are male and female sex hormones. In what ways do these molecules differ from each other?
Forces of 3N and 4N act at right angles on a block of mass 5 kg. Show that the resulting acceleration is 1 m/s2.
How can FADH2 convert into FAD in vitro? Through what kind of biochemistry reaction and enzyme? I know that FADH2 can change into FAD when there is O2, but this process is said to be sl
If a person can jump a maximum horizontal distance (by using a 45° projection angle) of 2.2 m on Earth, what would be his maximum range on the Moon, where the free-fall acceleration is g/6 and g
When the paper is held 29 below the lens, the sunlight is focused on the paper and the paper ignites. What is the focal length of the lens?
A box of mass 29.9 kg is subject to a horizontal applied force of 378 N, and it accelerates to the right at 10.7 m/s2. What is the net x-direction force on the box?
Two small objects of equal weight are attached to the ends of a thin weightless bar that spins about an axis perpendicular to the bar at its center. Each mass is a distance d from the axis of rotati
A 40 kg barrel is rolled up a 10 meter long ramp to a height of 5 meters. how much does the barrel weigh? how much work was done? if the person exerted an effort force of 250 newtons to roll the ba
You shoot a 58-g pebble straight up with a catapult whose spring constant is 310 N/m. The catapult is initially stretched by 0.20 m. How high above the starting point does the pebble fly? Ignore air
A ranger in a national park is driving at 32 km/h when a deer jumps onto the road 50 m ahead of the vehicle. After a reaction time of t s, the ranger applies the brakes to produce an acceleration o
Three equal point charges, each with charge 1.25mC , are placed at the vertices of an equilateral triangle whose sides are of length 0.450m . What is the electric potential energy of the system?