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The hare runs at its maximum speed of 6.00 m/s toward the goal for 0.800 km and then stops to tease the tortoise. How close to the goal can the hare let the tortoise approach before resuming the rac
How close to the goal can the hare let the tortoise approach before resuming the race, which the tortoise wins in a photo finish? Assume that, when moving, both animals move steadily at their respec
A merry-go-round makes one complete revolution in 19s. A 44.3kg child sits on the horizontal floor of the merry-go-round 1.6m from the center. Find the horizontal force of friction that acts on the c
Discussion the RDA guidelines recommending less than 30% of total calories come from fat.
An old riddle asks, "which has more mass, a kilogram of feathers or a kilogram of iron? The answer is that they have the same mass. Based on your knowledge of density, which would take up more space
31g of copper pellets are removed from a 300C oven and immediately dropped into 90mL of water at 18C in an insulated cup. What will the new water temperature be?
A dockworker loading crates on a ship finds that a 18-kg crate, initially at rest on a horizontal surface, requires a 84-N horizontal force to set it in motion. However, after the crate is in motio
A thermos contains 165 cm3 of coffee at 85° C. To cool the coffee, you drop two 14-g ice cubes into the thermos. The ice cubes are initially at 0° C and melt completely. What is the final t
An ecologist studying plants in the desert performed the following experiment.
Assuming that spectral-line broadening is simply the result of atoms moving toward us or away from us at this random speed, estimate the thermal width (in nanometers) of the 656.3- solar line.
A 900 N crate is being pulled across a level floor by a force F of 360 N at an angle of 21° above the horizontal. The coefficient of kinetic friction between the crate and the floor is 0.25. Fi
In most biology experiments, the relationship between the independent and the dependent variable can be described as cause and effect, true or false? explain your answer.
A gymnast of mass 60.0 kg hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and assume that the rope does not stretch. Use the value 9.81 for the acceleratio
In the beat frequency demo the combination of the 330Hz and 331Hz tones produced beat tones 1 second apart. How far apart will the tones produced by the combination of 330Hz and 330.5Hz be?
What is electric flux through a cube with side length 'A' enclosing a electric dipole, explain and also draw the field lines, what if dipole can move inside the cube.
In what seat nearest the middle seat of the row (on either side) will it be most difficult to hear a tone of 3430 Hz from the speaker? [The speed of sound in 20°C air is 343 m/s.]
A 20-rm kg loudspeaker is suspended 2.0 rm m below the ceiling by two ropes that are each 30^circ from vertical. What is the tension in the ropes?
A block of mass 2.50 kg is pushed 2.20 m along a frictionless horizontal table by a constant 16.0-N force directed 25 degrees below the horizontal. Determine the work done by (a) the applied force,
A plane flies from base camp to Lake A, 250 km away in the direction 20.0° north of east. After dropping off supplies it flies to Lake B, which is 260 km at 30.0° west of north from Lake A.
If you weigh 690 N on the earth, what would be your weight on the surface of a neutron star that has the same mass as our sun and a diameter of 25.0 km?
A 0.255 kg puck, initially at rest on a frictionless horizontal surface, is struck by a 0.200 kg puck that is initially moving along the x axis with a velocity of 2.06 m/s. After the collision, the
If half the kinetic energy of the bullet is transformed into internal energy and remains with the bullet while the other half is transmitted to the tree, what is the increase in temperature of the b
A child on a boat throws a 5.40-kg package out horizontally with a speed of 10.0 m/s. Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child
A 116 kg chesterfield is pushed up a frictionless ramp at a constant speed by a delivery person. ff the ramp is inclined at 25.8° to the horizontal. What is the magnitude of the normal force th
Which converts solar energy to electrical energy with an efficiency of 26%. In one hour, how much electrical energy does the panel produce?