Physics

All new and solved questions in Physics category

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INterstellar space Problem
Interstellar space, far from any stars, is filled with a very low density of hydrogen atoms (H, not H_2). The number density is about 1atom/cm^3 and the temperature isabout 3 K. Estimate the pressure in interstellar space. Give your answer in Pa and in atm.Answers4.14*10^17 Pa4.09*10^-22 atmThe rms ...
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Physics
Point P is at a potential of 500.0 kV and point S is at a potential of 200.0 kV. The space between these points is evacuated. When a charge of +2e moves from P to S,by how much does its kinetic energy change?...
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A steel ball rolls off a table top 60 cm high
a steel ball rolls off a table top 60 cm high. if the ball strikes the floor at a distance 50 cm from the base of the table, what was its velocity at the instant it left the table?...
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Europa, a moon of Jupiter, has an orbital diameter of 1.34 x 10^9 m, and a period of 3.55 days
Europa, a moon of Jupiter, has an orbital diameter of 1.34 x 10^9 m, and a period of 3.55 days. What is the mass of Jupiter?...
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Diffraction grating
A diffraction grating with 13400 lines per 2.54 cm (i.e., per inch) is used to view the visible spectrum from hydrogen gas excited by an electrical discharge. At whatangle from the beam axis will the first order peak for the red photons (wavelength 656 nm) occur?Please show all the work, it is much ...
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A tennis ball with a speed of 21.2 m/s is moving perpendicular to a wall
A tennis ball with a speed of 21.2 m/s is moving perpendicular to a wall. After striking the wall, the ball rebounds in the oppositedirection with a speed of 10.9816 m/s. If the ball is in contact with the wall for 0.00862 s, what is the average acceleration of the ball while it is in contact with t...
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A rifle bullet is fired from the top of a cliff at an angle of 30o below the horizontal
A rifle bullet is fired from the top of a cliff at an angle of 30o below the horizontal. The initial velocity of the bullet is 800 m/s. If the cliff is 80 m high, how far does it travel horizontally?...
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Average Velocity
A car travels along a straight, level road. The car begins a distance x = 28.5 m from the origin at t = 0.0 s. At t = 5.1 s the car is at x = 100 m; at t = 7.2 s it isat x = 200 m. Find the average velocity of the car during the interval from t = 0.0 s to t = 5.1 s...
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Physics
Two equal charges of 6.9 C are located in thexy-plane, one at (0 m, 67.1 m) and the otherat (46.9 m, 0 m).Find the magnitude of the electric ?eldat the origin due to these two charges.The value of the Coulomb constant is8.98755 × 10^9 Nm^2/C^2.Answer in units of N/C...
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The light that plants absorb to perform photosynthesis
The light that plants absorb to perform photosynthesis has a wavelength that peaks near 675 nm . Express this distance in millimeters. Express this distance in inches....
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A robot probe drops a camera off the rim of a 245 m high cliff on Mars, where the free-fall acceleration is 3.7 m/s2
A robot probe drops a camera off the rim of a 245 m high cliff on Mars, where the free-fall acceleration is 3.7 m/s2. Find the velocity with which it hits the ground. Answer in units of m/s. 2)Find the time required for the camera to reach the ground. Answer in units of s. please show work...
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5)A ball is thrown horizontally at 10.0 m/s from the top of a hill 50.0 m high
5)A ball is thrown horizontally at 10.0 m/s from the top of a hill 50.0 m high. How far from the base of the hill would the ball hit the ground? 45.0 m 6)A missile launched at a velocity of 30.0 m/s at an angle of 30.0 to the normal. What is the maximum height the missile attains? 11.5 m...
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A ball moving horizontally clears a net 2 meters high
1. A ball moving horizontally clears a net 2 meters high. What maximum speed can it have if it is to fall within 5 meters of the net? 2.A pulley system lifts a load of 800 Newtons, 20 centimeters while the rope pulling it moves 100 cm. a. How much force must be applied to lift the load? b. What i...
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Magnitude of the gravitational field. Please help!!!
The trajectory ofa rock thrown from a height with an initial speed of 17.3 m/s is shown in the figure below. Evaluate the magnitude of the gravitational field at the surface of theplanet. The planet has no atmosphere....
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The space shuttle is in a 150km-high circular orbit
The space shuttle is in a 150km-high circular orbit. It needs to reach a 560km-high circular orbit to catch the Hubble Space Telescope for repairs. The shuttle's mass is 7.00×10^4kg. How much energy is required to boost it to the new orbit? In the original orbit, I calculated the shut...
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Flywheels are large, massive wheels used to store energy
Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. An industrial flywheel has a 1.5 m diameter and a mass of 250 kg. Its maximum angular velocity is 1200 rpm. Q: A mo...
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A wire of resistivity ? must be replaced in a circuit by a wire four times as long. If, however,...
A wire of resistivity ? must be replaced in a circuit by a wire four times as long. If, however, the total resistance is to remain as before, the diameter of the newwire must1) be two times smaller.2) be four times smaller.3) be four times larger.4) remain unchanged.5) be two times larger...
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Question: Find the velocity in meters per second of a swimmer who swims 110 m toward the shores in 72 s
Question: Find the velocity in meters per second of a swimmer who swims 110 m toward the shores in 72 s?Question 2: Find the velocity in meters per second of a baseball thrown 38 m from third base to first base in 1.7 s?Question 3: Calculate the displacement in meters that a cyclist would travel in ...
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(a) a person in a wheelchair approaches a 0.50-m-high ramp with a speed of 3.5 m/sec
(a) a person in a wheelchair approaches a 0.50-m-high ramp with a speed of 3.5 m/sec. calculate the final speed of the wheelchair at the top of the ramp if the person coasts up and friction is negligible. (b) what initial speed would be necessary to be 1.0 m.sec? i need this asap :( thank you!!!!...
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A cat chases a mouse across a 1.0 m high table
A cat chases a mouse across a 1.0 m high table. the mouse steps out og the way, and the cat slides off the table and strikes the floor 2.2 m from the edge of the table. When the cat slid off the table, what was it's speed?...

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