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The figure below shows two very long straight wires (in cross section) that each carry a current of 3.82 A directly out of the page. Distance d1 = 9.00 m and distance d2 = 6.50 m. What is the magnitude of the net magnetic field at point P, which lies on a perpendicular bisector to the wires?
The figure below shows two very long straight wires (in cross section) that each carry a current of 3.82 A directly out of the page. Distance d1 = 9.00 m and distance d2 = 6.50 m. What is the magnitude of the net magnetic field at point P, which lies on a perpendicular bisector to the wires?
2 answers · Physics · 8 months ago
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A strip of copper 120 µm wide is placed in a uniform magnetic field of magnitude 0.75 T, perpendicular to the strip. A current i = 24 A is then sent through the strip. Find the ratio of the Hall electric field E to the electric field EC responsible for moving charge (the current) along the length of the strip (E/EC). (The number of charge carriers... show more
A strip of copper 120 µm wide is placed in a uniform magnetic field of magnitude 0.75 T, perpendicular to the strip. A current i = 24 A is then sent through the strip. Find the ratio of the Hall electric field E to the electric field EC responsible for moving charge (the current) along the length of the strip (E/EC). (The number of charge carriers per unit volume for copper is 8.47 × 1028 electrons/m3 and its resistivity is 1.69 × 10-8 ohm-m.)
1 answer · Physics · 8 months ago
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Calculate the work done by an external agent during an isothermal compression of 6.32 mol of oxygen from a volume of 31.5 L at 0°C to 14.3 L.
Calculate the work done by an external agent during an isothermal compression of 6.32 mol of oxygen from a volume of 31.5 L at 0°C to 14.3 L.
1 answer · Physics · 11 months ago
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Calculate the rotational inertia of a wheel that has a kinetic energy of 17.7 kJ when rotating at 323 rev/min.
Calculate the rotational inertia of a wheel that has a kinetic energy of 17.7 kJ when rotating at 323 rev/min.
1 answer · Physics · 1 year ago
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Calculate the rotational inertia of a meter stick, with mass 0.283 kg, about an axis perpendicular to the stick and located at the 38.1 cm mark. (Treat the stick as a thin rod.)
Calculate the rotational inertia of a meter stick, with mass 0.283 kg, about an axis perpendicular to the stick and located at the 38.1 cm mark. (Treat the stick as a thin rod.)
1 answer · Physics · 1 year ago
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A 4.3 kg sloth hangs 3.1 m above the ground. (a) What is the gravitational potential energy of the sloth–Earth system if we take the reference point y = 0 to be at the ground? If the sloth drops to the ground and air drag on it is assumed to be negligible, what are the (b) kinetic energy and (c) speed of the sloth just before it reaches the ground?
A 4.3 kg sloth hangs 3.1 m above the ground. (a) What is the gravitational potential energy of the sloth–Earth system if we take the reference point y = 0 to be at the ground? If the sloth drops to the ground and air drag on it is assumed to be negligible, what are the (b) kinetic energy and (c) speed of the sloth just before it reaches the ground?
1 answer · Physics · 1 year ago
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A 16 kg block is accelerated at 2.7 m/s2 along a horizontal frictionless surface, with the speed increasing from 15 m/s to 32 m/s. What are (a) the change in the block's mechanical energy (in kJ) and (b) the average rate at which energy is transferred to the block? What is the instantaneous rate of that transfer when the block's speed is (c)... show more
A 16 kg block is accelerated at 2.7 m/s2 along a horizontal frictionless surface, with the speed increasing from 15 m/s to 32 m/s. What are (a) the change in the block's mechanical energy (in kJ) and (b) the average rate at which energy is transferred to the block? What is the instantaneous rate of that transfer when the block's speed is (c) 15 m/s and (d) 32 m/s?
1 answer · Physics · 1 year ago
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The figure shows an initially stationary block of mass m on a floor. A force of magnitude 0.500mg is then applied at upward angle θ = 20°. What is the magnitude of the acceleration of the block across the floor if (a) μs = 0.620 and μk = 0.540 and (b) μs = 0.410 and μk = 0.300?
The figure shows an initially stationary block of mass m on a floor. A force of magnitude 0.500mg is then applied at upward angle θ = 20°. What is the magnitude of the acceleration of the block across the floor if (a) μs = 0.620 and μk = 0.540 and (b) μs = 0.410 and μk = 0.300?
2 answers · Physics · 1 year ago
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A drum rotates around its central axis at an angular velocity of 14.3 rad/s. If the drum then slows at a constant rate of 2.29 rad/s2, (a) how much time does it take and (b) through what angle does it rotate in coming to rest?
A drum rotates around its central axis at an angular velocity of 14.3 rad/s. If the drum then slows at a constant rate of 2.29 rad/s2, (a) how much time does it take and (b) through what angle does it rotate in coming to rest?
1 answer · Physics · 1 year ago
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Calculate the rotational inertia of a meter stick, with mass 0.317 kg, about an axis perpendicular to the stick and located at the 27.8 cm mark. (Treat the stick as a thin rod.)
Calculate the rotational inertia of a meter stick, with mass 0.317 kg, about an axis perpendicular to the stick and located at the 27.8 cm mark. (Treat the stick as a thin rod.)
1 answer · Physics · 1 year ago
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Two skaters, one with mass 58 kg and the other with mass 44 kg, stand on an ice rink holding a pole of length 9.8 m and negligible mass. Starting from the ends of the pole, the skaters pull themselves along the pole until they meet. How far does the 44 kg skater move?
Two skaters, one with mass 58 kg and the other with mass 44 kg, stand on an ice rink holding a pole of length 9.8 m and negligible mass. Starting from the ends of the pole, the skaters pull themselves along the pole until they meet. How far does the 44 kg skater move?
1 answer · Physics · 1 year ago
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A force in the negative direction of an x axis is applied for 30 ms to a 0.39 kg ball initially moving at 14 m/s in the positive direction of the axis. The force varies in magnitude, and the impulse has magnitude 43.4 N s. (a) What is the ball's velocity (including sign for direction) just after the force is applied? (b) What is the average... show more
A force in the negative direction of an x axis is applied for 30 ms to a 0.39 kg ball initially moving at 14 m/s in the positive direction of the axis. The force varies in magnitude, and the impulse has magnitude 43.4 N s. (a) What is the ball's velocity (including sign for direction) just after the force is applied? (b) What is the average magnitude of the force on the ball?
2 answers · Physics · 1 year ago
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A worker pushed a 24 kg block 12 m along a level floor at constant speed with a force directed 36° below the horizontal. If the coefficient of kinetic friction between block and floor was 0.18, what were (a) the work done by the worker's force and (b) the increase in thermal energy of the block-floor system?
A worker pushed a 24 kg block 12 m along a level floor at constant speed with a force directed 36° below the horizontal. If the coefficient of kinetic friction between block and floor was 0.18, what were (a) the work done by the worker's force and (b) the increase in thermal energy of the block-floor system?
2 answers · Physics · 1 year ago
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An outfielder throws a baseball with an initial speed of 73.8 mi/h. Just before an infielder catches the ball at the same level, the ball's speed is 81 ft/s. In foot-pounds, by how much is the mechanical energy of the ball-Earth system reduced because of air drag? (The weight of a baseball is 9.0 oz.)
An outfielder throws a baseball with an initial speed of 73.8 mi/h. Just before an infielder catches the ball at the same level, the ball's speed is 81 ft/s. In foot-pounds, by how much is the mechanical energy of the ball-Earth system reduced because of air drag? (The weight of a baseball is 9.0 oz.)
2 answers · Physics · 1 year ago
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A 19 kg block is accelerated at 2.5 m/s2 along a horizontal frictionless surface, with the speed increasing from 12 m/s to 32 m/s. What are (a) the change in the block's mechanical energy (in kJ) and (b) the average rate at which energy is transferred to the block? What is the instantaneous rate of that transfer when the block's speed is (c)... show more
A 19 kg block is accelerated at 2.5 m/s2 along a horizontal frictionless surface, with the speed increasing from 12 m/s to 32 m/s. What are (a) the change in the block's mechanical energy (in kJ) and (b) the average rate at which energy is transferred to the block? What is the instantaneous rate of that transfer when the block's speed is (c) 12 m/s and (d) 32 m/s?
2 answers · Physics · 1 year ago
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A 86 kg man lying on a surface of negligible friction shoves a 85 g stone away from himself, giving it a speed of 2.3 m/s. What speed does the man acquire as a result?
A 86 kg man lying on a surface of negligible friction shoves a 85 g stone away from himself, giving it a speed of 2.3 m/s. What speed does the man acquire as a result?
2 answers · Physics · 1 year ago
• ### Physics Help!!! A 3.9 kg sloth hangs 3.1 m above the ground.?

A 3.9 kg sloth hangs 3.1 m above the ground. (a) What is the gravitational potential energy of the sloth–Earth system if we take the reference point y = 0 to be at the ground? If the sloth drops to the ground and air drag on it is assumed to be negligible, what are the (b) kinetic energy and (c) speed of the sloth just before it reaches the ground?
A 3.9 kg sloth hangs 3.1 m above the ground. (a) What is the gravitational potential energy of the sloth–Earth system if we take the reference point y = 0 to be at the ground? If the sloth drops to the ground and air drag on it is assumed to be negligible, what are the (b) kinetic energy and (c) speed of the sloth just before it reaches the ground?
2 answers · Physics · 1 year ago