Which lens is shown in the diagram?

Which type of modulation is used in these technologies? AM programs: Cell phones: FM programs: Television:

An object is dropped from 26 feet below the tip of the pinnacle atop a 702 ft tall building. The height h of the object after t seconds is given by the equation h=-16t^2+676. Find how many seconds pass before the object reaches the ground.

A rock of mass m is thrown straight up into the air with initial speed |v0 | and initial position y = 0 and it rises up to a maximum height of y = h.

If we increase the speed of rotation of wheel then the sound produced by cardboard touching the spokes of the wheel will become A) shrill (b) grave (c) remains the same

One of the following statements is incorrect, (a) The car traveled around the track at a constant velocity. (b) The car traveled around the track at a constant speed. Which statement is incorrect and why?

Explain what surface tension is.

A helium-filled balloon is launched when the temperature at ground level is 27.8°c and the barometer reads 752 mmhg. if the balloon's volume at launch is 9.47 * 10^{4} 4 l, what is the volume in liters at a height of 36 km, where the pressure is 73.

Consider the moment when the spring is at its maximum compression. At that moment, the kinetic energy, the gravitational potential energy, and the elastic potential energy are, respectively, a - zero, at a maximum, and at a maximum b - at a maximum,

Ari, a young patient who is regularly treated by a psychiatrist, feels compelled to carry out repetitive tasks the same way very frequently. If Ari does not conduct these tasks with extreme precision, he can feel extremely nervous and uncomfortable.

A friend says, "Stars produce energy by a fusion chain reaction of helium into hydrogen." Evaluate the validity of this statement. A) It is an valid statement. Stars produce energy by a fusion chain reaction of hydrogen into helium.