Physics Answers

One liter of air is cooled at constant pressure until its volume is halved, and then is

allowed to expand isothermally back to its original volume. Draw the process on

the PV diagram.

An ideal gas expands isothermally, performing 3.40x103 J of work in the process.

Calculate (a) the change in the internal energy of the gas, and (b) the heat

absorbed during the expansion.

A ray of light in the air strikes a glass plate (n=1.5) at an incidence angle of 50°. determine the angle of transmission.

A concave spherical mirror has a focal length of 5 cm an object o,3 cm height, is placed 8 cm in front of the mirror.by constructing a ray diagram, determine the position and height of it's image.

a vibration of frequency 5 Hz sends a wave of wavelength 0.8 m down a rope. What is the speed of the wave

A V-canyon supports a 100-ft high, constant-angle (120°) arch dam. If the canyon is 60 ft wide at the top and the design freeboard is 6 ft (ie., the water level is 6 ft below the top of the dam), determine the abutment reactions at dam heights of 25, 50, and 75 ft above the bottom of the canyon.

Find the change in volume of 30 L of a fluid when subjected to a

pressure increase of 2.0 MPa. The bulk modulus of elasticity of the

fluid is 2.24 GPa.

A 10.00 CM tall light bulb is placed at a distance of 90.0 CM from a concave mirror

having a focal length of 21 CM Determine the image distance and the image size

A ball of mass m1=4kg and a block of mass m2=10kg

are attached by a lightweight cord that passes

over a frictionless pulley of negligible mass, as in figure below. The block lies on a frictionless incline of

angle θ=48 degrees. Find the magnitude of the acceleration of the two objects and the tension in the cord.

What is matter made of?