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A spring with constant k=30N/m is used to shoot a block (mass 1kg) across a frictional horizontal surface. what is the force of friction acting on the block
A one loop circuit is connected thus: A 3.0 V source, with the + side connected to a 10 ohm resistor, how much power does the bulb dissipate
A siren has a frequency of 875 Hz when it and an observer are both at rest. The observer then starts to move and finds that the frequency he hears is 1251 Hz. What is the speed of the observer
Design an amplifier using a 741 that has a gain of 20. What are the input and output impedances of your amiplifer
Why is it that some people seem to have a 'good' immune system (i.e., they never get sick), whereas others seem to catch every illness that comes along? Given what you have learned so far, which c
Part a asked to find allele & genotype frequencies assuming HWE.
a 4.6kg sphere made of metal whose density is 3800kg/m^3, is suspended by a cord. What fraction of the volume of the sphere is submerged
What are the subdivisions of biology What are the subdivisions of biology
A car and driver have a combined mass of 100 kg. What is the force of the hill on the car as it passes over the top
How much of a 25mg/ml chloramphenicol stock solution do we need to make 400 ml of growth media that has final 25ug/ml concentration of chloramphnicol?
Two elastic particles, each with mass m, collide head on. Initially they have speeds v1 and v2. What are their speeds after the collision
What does polar mean in relation to a hydrogen bond?
a 5g snail crawls at 0.6mm/s between two rocks 14 cm apart. Treating this system as an infinite square well, determine the approximate quantum number
A express train travels along a straight line between two stations, A and D. Stations B and C are spaced evenly along the line between A and D. The engineer leaves A and accelerates at a consta
The velocity vs time graph of an object is approximated by a triangle which starts at v=0 at t=0, rises to a maximum of v=6 m/s at t=6 sec, then returns to zero at t=10 sec. How far did the obje
Archer fish often prey for flies that hover above the water. The index of refraction of water is 1.33. what would be a "safe" horizontal seperation for the fly
Find the acceleration of a forklift of mass 1400 kg pushed by a force of 2100 N that is opposed by a frictional force of 425 N.
Calculate the energy needed to accelerate a spaceship with a mass m = 25 × 103 kg toa speed of 0.40c. Compare this number with the approximate annual energy usage ofEarth, 1021 J
1)A crate of potatoes of mass 19.0 kg is on a ramp with angle of incline 30° to the horizontal. The coefficients of friction are μs = 0.82 and μk = 0.29. Find the frictional force (magn
An open container holds ice of mass 0.595kg at a temperature of -13.5 celcius . The mass of the container can be ignored. How much time passes before the ice starts to melt
A crate of potatoes of mass 8.0 kg is on a ramp with angle of incline 30° to the horizontal. The coefficients of friction are μs = 0.72 and μk = 0.43. Find the frictional force (magnitu
A very thin sheet of glass (n=1.5) floats on the surface of water (n=1.33). When illuminated with white light at normal incidence, What is the thickness of the glass
An iron bar of mass, 0.55 kg, slides down a frictionless incline 0.41 m high. What is the speed of the combined masses after collision
A skateboarder shoots off a ramp with a velocity of 6.9 m/s, directed at an angle of 56 ° above the horizontal. The end of the ramp is 1.1 m above the ground. how far is this point horizontally
A cryogenic storage container holds liquid helium, which boils at 4.2 K. Suppose a student painted the outer shell of the container black, Determine the rate of heat loss due to radiation