Ultimate Physics Study Guide - Questions & Answers

172) suppose that a heavy person and a light person are balanced on a teeter- totter made of a plank of 172) wood. each person now moves in toward the fulcrum a distance of 25 cm. what effect will this have on the balance of the teeter- totter?
1 Answer
the moment of inertia of an object of mass m(a)m(a) is an intrinsic property of the object, (b) depends on the choice of axis of rotation, (c)(c) is proportional to mm regardless of the choice of axis, (d)(d) both (b)(b) and (c)(c) are correct.
1 Answer
a 79.0-kg person stands on a scale in an elevator. what is the apparent weight in each of the following situations? (a) when the elevator is accelerating upward with an acceleration of 2.00 m/s2
1 Answer
The mass of a hoop with a radius of 1.0 m is 6.0 kg. It rolls across a horizontal surface with a speed of 10.0 m/s. How much work is required to stop the hoop?
1 Answer
T/F High voltage, low current transmission lines are used in the grid to minimize resistive heating losses
1 Answer
the law of conservation of energy cannot be created nor destroyed, it can only change form. if this is the case, why are we worried about energy sources in our world?
1 Answer
a mass m at the end of a spring oscillates with a frequency of 0.83 hz. when an additional 780-g mass is added to m, the frequency is 0.60 hz. what is the value of m?
1 Answer
a ball of mass 0.5 kg, initially at rest, acquires a speed of 4 m/s immediately after begin kicked by a force of strength 20 n. for how long did this act on the ball?
1 Answer
a rifle is used to shoot twice at a target, using identical car- tridges. the first time, the rifle is aimed parallel to the ground and di rectly at the center of the bull's-eye. the bullet strikes the target at a distance of ha below the center, however. the second time, the rifle is similarly aimed, but from twice the distance from the target. this time the bullet strikes the target at a distance of hp below the center. find the ratio hp/ha.
1 Answer
a fictional news report stated that starship enterprise had just returned from a 10-year voyage while traveling at 0.70ccpart a if the report meant 10 years of earth time, how much time elapsed on the ship? part a if the report meant 10 years of earth time, how much time elapsed on the ship?(in years) part b if the report meant 10? years of ship time, how much time passed on earth?(in years)
1 Answer
a car is stopped at a traffic signal. when the light turns green, the car accelerates from 0 to 4.1 m/s in 0.526 seconds. what is the average force in n (newtons) experienced by a passenger of mass 81.9 kg in the car when the car accelerates?
1 Answer
which pieces of information are necessary to describe an object's motion? responses position and direction position and direction, direction and speed direction and speed, position and speed position and speed, position, direction, and speed
1 Answer
dr. lamb and dr. whitcomb discuss their paper on collisions and gravity waves and the ligo project, which is a ground-based experiment to detect gravity waves from space. what is their main contribution to the news discussed in this article?
1 Answer
5. a hockey puck struck by a hockey stick is given an initial speed of 10 m/s. if the coefficient of kinetic friction between ice and puck is 0.10, how far will the puck slide before stopping?
1 Answer
a boat has a velocity of 8.0 m/s, east. it is crossing a river that is 20.0 m wide. the current in the river flows south at 5.0 m/s. how long will it take the boat to cross the river? how far downstream does it land from its starting point?
1 Answer
the radiative zone of the sun is just outside the core which has temperatures of about 7 million degrees celsius. t or f
1 Answer
A(n) ____________________ is a dynamic variable on the free store without any pointer pointing to it.
2 Answers
galvanic cell sketched below is powered by the following reaction: Zn(s)+pdso4(aq) ZnSO4(aq)+Pd(s) e- E1 E2 S1 S2 Write a balanced equation for the half-reaction that happens at the cathode of this cell. Write a balanced equation for the half-reaction that happens at the anode of this cell Of what substance is E1 made?
1 Answer
there must be equal amounts of mass on both side of the center of mass of an object.T/F
1 Answer
The speedometer of a car moving to the east reads 55 mph. it passes another car that moves to the west at 55 mph. a the cars have the same speed and the same velocity. b the cars have the same speed but not the same velocity.
1 Answer
Using the illustration below, let's say the first kid is pushing with the force of 75N to the right and the second kid is pushing with a force fo 130 N to the right. What would the net force be on the kid and the scooter?
1 Answer
what initial mass of uranium would have to undergo fission to supply the electrical needs of sich a house for a year
1 Answer
a spaceship is moving at a speed of 0.900 c relative to the earth. what is the ratio of the lenght of the spacecraft
1 Answer
to help overcome the problem of skin effect in high frequency circuit condcutor with a large amount of must be used?
1 Answer