12,748 Answered Questions for the topic physics

Physics

03/27/23

The mass of a star is 1.61·1031 kg and its angular velocity is 1.40E-7 rad/s. Find its new angular velocity if the diameter suddenly shrinks to 0.17 times its present size.

Assume a uniform mass distribution before and after. Icm for a solid sphere of uniform density is 2/5 mr2.
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Physics

03/27/23

Two astronauts are tethered together on a space walk and rotate around each other. They each weigh 95 kg and are 360 m apart. The period of rotation was 55 seconds.
What would be their new distance apart if they pulled themselves together until the period became 35.2 seconds?
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Physics

03/27/23

A bug that has a mass mb = 4 g walks from the center to the edge of a disk that is freely turning at 32 rpm. The disk has a mass of md = 12 g.

If the radius of the disk is R = 28 cm, what is the new rate of spinning in rpm?
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Physics

03/27/23

A figure skater is spinning with an initial angular speed of 9.4rad/s. He then pulls his arms in, reducing his moment of inertia to 0.30 times its original value.
What is his angular speed after pulling in his arms?
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Physics

03/27/23

A jetliner touches down
A jetliner touches down at 220 km/h and comes to a halt(stop) 29 s later. What is the shortest runway on which this aircraft can land?
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Physics

03/27/23

What should your acceleration be if you are to catch up by the finish line?

After 35 min of running, at the 9 km point in a 10 km race, you find yourself 100 m behind the leader and moving at the same speed. What should your acceleration be if you are to catch up by the... more
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03/26/23

Help-Calculate the conductivity of insulating material.
Example 3.38. An electric cable of 12 mm diameter is insulated to increase the current capacity. Due to insulation the current carrying capacity is increased by 15% without increasing cable surface... more
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Physics

03/25/23

Can Someone Help me?
A 181 g block is launched by compressing a spring of constant k=200N/m at a distance of 15 cm. The spring is mounted horizontally, and the surface directly under it is frictionless. But beyond the... more
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Physics

03/25/23

A 4.8 Hz continuous wave travels on a Slinky. If the wavelength is 0.53 m, what is the speed of waves on the Slinky (in m/s)?
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Physics

03/24/23

Gravity affects speed, one of the six components of skill-related fitness. Is this true?
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Physics

03/24/23

Gravity affects speed, one of the six components of skill-related fitness. True or False
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Physics

03/23/23

Physics Force Problem
A 48.5 kg car is towed up a hill at 15.3◦ to the horizontal. The tow line exerts a force of 138 N on the car. The car starts from rest at the bottom of the hill, no friction. Use 9.81 for G. How... more
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Physics

03/23/23

Can Someone Help me with this Physics Question

A bug lands on top of the frictionless, spherical head of a bald man. It begins to slide down his head.Find the vertical distance in terms of the radius r of the head measured from the top of the... more
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Physics

03/22/23

I don't understand why my final velocity is wrong on this incline question.

A can of soup travels down an inclined plane which is 3.00 m long and makes an angle of 25 degrees with the horizontal. It travels this distance in 1.50 seconds. What is the final velocity,... more
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Physics

03/22/23

Torque ----------

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Physics

03/22/23

What is the speed of sound in m/s in carbon dioxide at the normal boiling temperature of water?

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Physics

03/21/23

Torque and Conservation of energy
Sketch a 0.5 meter wrench, and apply two diagonal forces (which produce torque) to it. Please use two decimal places for the magnitude of each force, and while the torques can each be either... more
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Physics

03/20/23

Angular kinematics

A wheel 2.20 m in diameter lies in a vertical plane and rotates with a constant angular acceleration of 4.10 rad/s2. The wheel starts at rest at t = 0, and the radius vector of a certain point P on... more
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Physics

03/20/23

water vapor and temperature
An apartment has the dimensions 20 m by 10 m by 7 m. The temperature is 35°C, and the relative humidity is 52 percent. What is the total mass (in kg) of water vapor in the air in the apartment?
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03/19/23

Ideal gas law question
The pistons of two identical cylinders are rigidly connected to each other. The cylinders contain the same amount of the same heated gas. Suppose that one cylinder is heated and the other is... more
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03/17/23

Interesting physics problem about ice ball in Sun's orbit
An ice ball flew into the Sun's orbit and began to melt. Find the time it takes for this ball to melt if the distance from it to the Sun is d and the initial radius of the ball is R0. Ice density... more
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03/17/23

What thickness of ice will form on the surface of the lake
What thickness of ice will form on the surface of the lake in time t if the temperature of the enviroment is TA is constant and the surface temperature of the lake is equal to the temperature of... more
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03/17/23

Physics problem about a sphere in space
In open space, a sphere of radius R is filled with a liquid whose initialtemperature T0 (higher than its enviroment). Find the dependence of temperature of the liquid with time. The mass of the... more
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Physics

03/16/23

temperature question
An aluminum wing on a passenger jet is 38 m long when its temperature is 22°C. At what temperature would the wing be 7 cm (0.07 m) shorter?
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03/16/23

Thermodynamics: Thermal conductivity in a pipe
You have a pipe A (inner and outer radii are r0 and r1) made from material, whose thermal conductivity coefficient K1. What thickness should different pipe B have, which has the same flow rate and... more
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