Physics Answers

A bird can fly 25 km/h. How long does it take to fly 3.5 km?

Spheres A, B, and C have charges +8.0 𝐶, +12.0 𝐶, and −5.0 𝐶, respectively. The three spheres are allowed to touch each other simultaneously and then separated. (a) What is the total charge on the three spheres before and after touching each other? (b) What is the final charge on each sphere assuming they are identical? (c) What is the final charge on each sphere assuming that 𝑟_𝐴=𝑟_𝐵=2𝑟_𝐶?

A hovercraft passes point A moving West with a speed of 15 m s−1.

The hovercraft immediately begins to accelerate at a steady rate of 0.13 m s−2 North.

What is the magnitude of the velocity of the hovercraft 200 s after it passes point A? (in m s−1)

Give your answer to 2 s.f.

(note: a hovercraft rides on a cushion of air and so does not contact the ground and experiences no frictional forces)

How can you distinguish a raw egg from a hard-boiled one by spinning each one on a table?

A hollow cylinder and a solid cylinder have the same mass and the same diameter. They are released at the same time from rest from the top of an incline. Which will reach the bottom first?

projectile is fired with an initial velocity of 193.2 feet per second upward at angle of 300to the horizontal from point 257.6 feet above a level plain. What horizontal distance will it cover before it strikes the level plain? A dart is thrown horizontally with an initial speed of 10 m/s toward point P, the bull's-eye on a dart board. It hits at point Q on the rim, vertically below P, 0.2 s later. What is the distance PQ? How far away from the dart board is the dart released? 3 Find the angle of elevation of a gun which fires a shell with muzzle velocity 366 m/s at a target on the same level but 4,575 m distant.

A drug is being delivered into a patient's arm at a rate of 10 mL min-¹. The drug is being delivered from a syringe through a 5 cm long needle with an internal diameter of 1mm. If patient's blood pressure is 110mmHg (+15.0 kPa gauge preasure, and ignoring the variation from systolic to diastolic), what must the pressure in thw syringe be? (ndrug= 8.90x10-4 Pa.s

Describe in a creative way the effect of temperature increases on the resistance of a metallic conductor. Also, describe the ability of the material to conduct current in terms of its resistivity and conductivity.

Note: You may express your answer through a drawing, just by making a slogan or a poster. It is all up to you as long as you can describe

The power of the heater is 2.4W. 1. Calculate how long it takes for the heater to supply the energy calculated in (a)(i).

Barney walks at a velocity of 1.7 meters/second on an inclined plane, which has an angle of 18.5° with the ground. What is the horizontal component of Barney’s velocity?