12,762 Answered Questions for the topic physics

Physics

11/29/22

law of conservation
Find the useful power output (in W) of an elevator motor that lifts a 2600 kg load a height of 45.0 m in 12.0 s, if it also increases the speed from rest to 4.00 m/s. Note that the total mass of... more
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Physics

11/29/22

law of conservation
A man on a motorcycle plans to make a jump a ramp.If he leaves the ramp with a speed of 35.0 m/s and has a speed of 33.5 m/s at the top of his trajectory, determine his maximum height (h) (in m)... more
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Physics

11/29/22

law of conservation
A 73.5-kg boy is surfing and catches a wave which gives him an initial speed of 1.60 m/s. He then drops through a height of 1.56 m, and ends with a speed of 8.51 m/s. How much nonconservative work... more
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Physics

11/29/22

law of conservation
how high (in m) a hill can a car coast up (engine disengaged) if friction is negligible and its initial speed is 92.0 km/h? (need a number.) (a)If, in actuality, a 750 kg car with an initial speed... more
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Physics

11/29/22

law of conservation
you have a light spring which obeys Hooke's law. This spring stretches 2.68 cm vertically when a 3.00 kg object is suspended from it. Determine the following.the force constant of the spring (in... more
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Physics

11/29/22

law of conservation
A 6.00 ✕ 105 kg subway train is brought to a stop from a speed of 0.500 m/s in 0.800 m by a large spring bumper at the end of its track. What is the force constant k of the spring (in N/m)? (need a... more
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Physics

11/29/22

You can jump to a height of 2.6625 ft (0.81153 m) on Earth. If you expend the same energy jumping on the moon where the acceleration of gravity is only 1.6 m/s2, how high would you rise?
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Physics

11/28/22

Which of the following best describes the response of ears to a sound's intensity I?
Which of the following best describes the response of ears to a sound's intensity I?A) ∝ I2B) ∝ IC) ∝ log10ID) ∝ √I
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Physics

11/28/22

Projectile Motion
A ball is thrown straight upward and returns to the thrower’s hand after 3.7 s in the air. A second ball is thrown at an angle of 45◦ with the horizontal. At what speed must the second ball be... more
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Physics

11/28/22

What is the acceleration of each block m1 = 2 kg and m2 = 3 kg? (two pulley system problem)
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Physics

11/28/22

A planet has twice the mass of Earth. How much larger would the radius of the planet have to be for the gravitational field strength, at the planet's surface to be the same as on Earth's surface?
How to solve.
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Physics

11/28/22

What is the orbital speed of the planet ? (G = 6.673 * 10 ^ - 11 * N * m ^ 2 / k * g ^ 2)
whats the answer? help
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Physics Math Science

11/27/22

Approximately how many times louder is the latter sound?
The sound level measured in a room by a person watching a movie on a home theater system varies from 40 dB during a quiet part to 80 dB during a loud part. Approximately how many times louder is... more
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Physics Math Science

11/27/22

How far away are the fish?
A sound pulse emitted underwater reflects off a school of fish and is detected at the same place 0.23 s later (see the figure below). How far away are the fish? (Assume the water temperature is 20°C.) more
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Physics Math Science

11/27/22

What is the size of the smallest feature observable in human tissue when examined with 18-MHz ultrasound?
Ultrasound probes can resolve structural details with sizes approximately equal to the wavelength of the ultrasound waves themselves. What is the size of the smallest feature observable in human... more
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Physics Math Science

11/27/22

How many times louder?
Approximately how many times louder is a 140-dB sound than a 80-dB sound?
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11/27/22

need help with math

I've been stuck on these problems for a while.Use the given transformation to evaluate the integral. ∫∫R 8xy dA, where R is the region in the first quadrant bounded by the lines y = 1x/3 and y = 2x... more
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Physics

11/27/22

A basketball player 1.93 m tall wants to make a basket from a distance of 14.3 m
The hoop is at a height of 3.05 m. If he shoots the ball (from 1.93 m) at a 48.7° angle, at what initial speed must he shoot the ball so it goes in the basket without touching the backboard.... more
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Physics

11/27/22

Projectile Motion
A cargo plane is flying horizontally at an altitude of 11.7 km with a constant speed of 1201 km/hr when a large crate slides out of the rear of the plane. How long does it take the crate to hit the... more
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Physics

11/27/22

Projectile Motion
A ball is thrown straight upward and returns to the thrower’s hand after 3.7 s in the air. A second ball is thrown at an angle of 45◦ with the horizontal. At what speed must the second ball be... more
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Physics

11/27/22

Projectile Motion
A basketball player 2 m tall wants to make a basket from a distance of 12 m. The hoop is at a height of 3.05 m. If he shoots the ball (from a height of 2 m) at a 29.1 ◦ angle, at what initial speed... more
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Physics

11/27/22

Projectile Motion
An arrow is shot at an angle 34 ◦ with the horizontal. It has a velocity of 48 m/s. How high will the arrow go? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m.If it went 36.717 m... more
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Physics

11/27/22

A scale contains a spring with a spring constant of 275 N/m. Placing a mass on the scale causes the spring to be compressed by 3.25 cm. Calculate the elastic potential energy stored in the spring
I am just confused. I need step by step.
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Physics

11/25/22

A ball is thrown straight upward and returns to the thrower's hand after 2.1 s in the air. A second ball is thrown at an angle of 41° with the horizontal.

At what speed must the second ball be thrown so that it reaches the same maximum height as the first? The acceleration of gravity is 9.8 m/s². Answer in m/s.
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11/25/22

please help with physics problem
A 530 lines/mm diffraction grating is illuminated by light of wavelength 540 nm. How many bright fringes are seen on a 3.5- m -wide screen located 2.2 m behind the grating?Please help
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