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Q. A child loses his balloon, which rises slowly into the sky. If the balloon is 23 cm in diameter when the child loses it, what is its diameter at the following altitudes? Assume that the balloon is very flexible and so surface tension can be neglected.
Q. A tsunami of wavelength 270 and velocity 750 travels across the Pacific Ocean. As it approaches Hawaii, people observe an unusual decrease of sea level in the harbors. Approximately how much time do they have to run to safety.
A hawk flies in a horizontal arc of radius 14 m at a constant speed of 5 m/s. (a) Find out its centripetal acceleration. (b) It continues loftly along the same horizontal arc but increases its speed at the rate of 1 m/s2. Find out the acceleration..
What is the shortest height a plane mirror must be so that a person who is 1.6 meters tall is able to see his or her whole body? plan a ray diagram to support your answer.
Perpetual motion machines have fascinated people especially inventors for hundreds of years before the laws of thermodynamics became known. Ideally, once energy is added to start a perpetual motion in machine, the machine would continue to operate..
A large wooden turntable in the shape of the flat disk has a radius of 2.00 {rm m} and a total mass of 120 {rm kg}. The turntable is initially rotating at 3 {rm rad}/{rm s} about a vertical axis through its center.
Two joggers run at a constant velocity of 7.5 m/s toward the east. At time t=0, one is 15m east of the origin and te other is 15m west.
An electron with initial velocity v0 = 1.20 × 10^5 m/s enters a region 1cm long where it is electrically accelerated. It emerges with velocity v = 5.87 × 10^5 m/s. What is its acceleration, assumed constant? (Such a process occurs in conventional ..
Express how unmet basic physiological needs of oxygen, nutrition, temperature, and humidity threaten clients' safety.
A positively charged light metal ball is suspended between two oppositely charged metal plates on an insulating thread as shown below. After being charged once, plates are disconnected from the battery. define the behavior of the ball.
When a pulse is amplified in a linear amplifier, the charge carrier transmit time can cause.
A plate carries a charge of -3.9 µC, while a rod carries a charge of +2.2 µC. How many electrons should be transferred from the plate to the rod, so that both objects have the same charge.
A rigid steel frame above the street intersection supports standard traffic lights, each of that is hinged to hang immediately below frame. A gust of wind sets light swinging in a vertical plane. Find out order of magnitude of its period. Situatio..
Write down the expression that shows the pressure
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