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Q1.A bat in a cave emits a sound pulse and receives an echo 0.22 second later. Assuming that the speed of sound is 339 m/s, how far did the sound (the longitudinal wave) travel during this time?
Q2. A baseball is hit nearly in a straight line up into the air with a speed of 41 m/s. How high it goes? And how long is it in the air?
Q3. Two charged spheres are 25.0 cm apart. They are moved, and force on each of them is found to have been doubled. How far apart are they now?
A 3.0 kg mass is supported by a steel wire of diameter 0.60 mm and length 1.4 m. How much will the wire stretch under this load
A man is running at speed c (much less than the speed of light) to catch a bus already at a stop. At t=0, while he is a distance b from the door to the bus, the bus starts moving with the positive acceleration a.
What is the total charge on Earth's surface implied. explain the strength and direction of an electric field.
One particle has a mass of 4.41 x 10-3 kg and a charge of +6.92 ?C. A second particle has a mass of 6.52 x 10-3 kg and the same charge. The two particles are initially held in place and then released.
Suppose that after a centrifuge in a medical laboratory is turned off, it continues to rotate with a constant angular deceleration for 10.40 s before coming to rest. How numerous revolutions did the centrifuge complete after being turned off.
if a hydroelectric facility is to produce 100 000 hp with an elevation difference of 300 ft, what is a suitable speed (in rpm) if a kaplan turbine, operating at high efficiency, is used
An inquisitive physics student and mountain climber climbs a 55 m cliff that overhangs a calm pool of water. She throws two stones vertically downward 0.8 s apart and observes that they cause a single splash.
A small, 300 {rm g} cart is moving at 1.30 {rm m/s} on an air track when it collides with a larger, 3.00 {rm kg} cart at rest. After the collision, the small cart recoils at 0.890 {rm m/s}.
1) Find the net force acting on particle 3 due to the presence of the other two particles. Report you answer as a magnitude and a direction measured from the positive x axis.
the velocity of a boat with respect to the water is 4.0 m/s at an angle of 30.0 degrees North of West. find the velocity of the boat with respect to the ground
A particle with a mass of 0.420 kg is attached to a horizontal spring with a force constant of 34.02 N/m. At the moment t = 0, Find the length of a simple pendulum with the same period
Two titanium spheres approach each other head-on with the same speed and collide elastically. What is the mass of the other sphere
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