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Physics
Physics
High School
4. a force f is exerted on a 7 kg block to move it across a rough surface, as shown. the magnitude of the force is initially 6 n, and the block moves at a constant velocity. while the block is moving, the force is instantaneously increased to 15 n. how much kinetic energy does the block now gain as it moves a distance 3 m?
Physics
High School
A person is driving his Lamborghini with a mass of 2,000 kg at 10 m/s. He sees a police car around the corner and slows down to 2m/s. What is his change in momentum? ________kgm/s
Physics
High School
Assume the elevator has a mass of 800kg and is slowing down as it descends at a rate of 2m/s. What is the tension in the cable?
Physics
High School
global temperatures are forecast to rise about 3c by the year 2100. which parts of the world are expected to experience the greatest temperature rise?
Physics
College
You would like a pendulum that swings back and forth once every 2 seconds, but the one you have swings once every 1.9 seconds. Which of the following should you do to adjust it so that it has the desired period?a) Add more mass to the pendulum.b) Make the pendulum slightly longer.c) No answer text providedd) Remove some mass from the pendulum.e) No answer text provided.f) Make the pendulum slightly shorter.
Physics
High School
what is a name for the marked angle? five rays. one ray starts at point a, then points down and to the left through point b. a second ray starts at point a, then points up and to the left through point e. a third ray starts at point a, then points up through point f. a fourth ray starts at point a, then points up and to the right through point d. a fifth ray starts at point a, then points down and to the right through point c. an orange curved line connects ray ad to ray ac.
Physics
High School
if r is the radius of the earth and g is the gravitational acceleration at the earth's surface, what is the gravitational acceleration at altitude h above the earth's surface?
Physics
High School
two coils are at fixed locations. when coil 1 has no current and the current in coil 2 increases at the rate 15.0 a/s, the emf in coil 1 is 25.0 mv. (a) what is their mutual inductance? (b) when coil 2 has no current and coil 1 has a current of 3.60 a, what is the flux linkage in coil 2?
Physics
High School
A 70-kg base runner begins his slide into second base when he is moving at a speed of 4. 0 m/s. The coefficient of friction between his clothes and earth is 0. 70. He slides so that his speed is zero just as he reaches the base. (a) how much mechanical energy is lost due to friction acting on the runner? (b) how far does he slide?.
Physics
High School
the threshold of hearing is defined as the minimum discernible intensity of the sound. it is approximately 1012w/m2 . find the distance d from the car at which the sound from the stereo can still be discerned. assume that the windows are rolled down and that each speaker actually produces 0.06 w of sound, as suggested in the last follow-up comment.
Physics
High School
A mass is connected to a spring and is allowed to move horizontally. The mass is at a position L when the spring is unstretched. The mass is then moved, stretching the spring, and released from rest. It then moves with simple harmonic motion. At the instant that the mass passes through the position where the spring is unstretched, what can be said about its instantaneous acceleration?
Physics
High School
what is the difference between the speed of an object and the acceleration of an object?
Physics
High School
a perfect unit impulse is applied to a sdof system at rest, having a mass 250 kg, stiffness 3000 n/m and damping ratio 0.2. the initial velocity of the system is:
Physics
High School
Scientists on earth are able to communicate with rovers on mars through their receivers, which can receive and process signals. Which of these best describes the signals sent and received by rovers?.
Physics
High School
If the forces acting on an object are balanced, what must be true about the motion of this object?.
Physics
High School
A peron lift a 4. 5 kg cement block a vertical ditance of 1. 2 m and then Carrie the block horizontally 7. 3 m. Determine the work done by the peron and by the force of gravity
Physics
College
why fan videos be streamed from the cloud to a computer with no lost quality
Physics
High School
according to kirchhoff's current law, the sum of the currents entering a closed surface must equal the sum of the currents leaving. explain how the law is satisfied for the closed surface shown when we use a real op amp in this circuit.
Physics
High School
If today is October 31st and we view a third quarter, on what date did we observethe last new moon?
Physics
College
What is the formula for conservation of energy if there is no resistance and no friction?
Physics
High School
If the coefficient of kinetic friction between the floor and bag is 0. 15, how much thermal energy does marissa create?.
Physics
High School
a heat engine is operating between 287 c and 32 c. if the engine extracted 400 mj of energy from fuel, how many mj of energy could be used as mechanical energy?
Physics
High School
why is frankenstein attracted to science? how does he look back on his attraction from his current perspective?
Physics
High School
an object of mass m is launched at an angle above the horizontal at speed v. find the maximum height g
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