A balloon is moving with velocity 10 m/s. it releases a stone which comes down the ground in 5 sec. the height of the balloon from the ground at the moment when the stone was dropped is?

How are electromagnetic waves different from mechanical waves? Electromagnetic waves are all high frequency; mechanical waves are all low frequency. Electromagnetic waves can travel through a vacuum; mechanical waves require a medium.

A person throws a 0.5 kg ball up in the air in 1.1 s. During this process the position of the ball changes from 0.5 m to 1.5 m (before being released) and the speed of the ball changes from 0 m/s to 7 m/s.

Which of the following has the most thermal energy? 1. A 1/2 liter mug of hot chocolate at 75 degrees 2. A 1 liter mug of hot chocolate at 75 degrees 3. They have the same amount of thermal energy because they are both at 75 degrees 4.

Select the correct answer. Light incident on a surface at an angle of 45° undergoes diffused reflection. At what angle will it reflect? A. only at angles less than 45° B. only at angles greater than 45° C.

Which statement best compares these two waves

A meandering river is flowing in a broad, alluvial valley and the river is silt-laden but also moves sand and a small amount of gravel. The government decides to build a dam across the valley for power and flood control.

The Sun 1. Sara has made this list to summarize what she learned in science class today: 1. Core 2. Radiation zone 3. Convection zone What is the best title for her list? a. The Layers of the Interior of the Sun b. The Layers of the Sun c.

Jack rolled a marble down a ramp and recorded the potential energy and kinetic energy of the marble at different positions on the ramp, as shown in the table.

Protons are the smallest particle of an element that retains the original Characteristics of the element. True or False

A 5kg rock and a 10kg rock are dropped from a height of 10m?