Physics Answers

The spring oscillates to the other end. The amplitude is 3.5m, k = 1.2, and angular frequency is = 4.3. Solve the frequency, wavelength, wave speed, period, wave number, and direction.

The police are investigating an accident. They have determined that the mass of car A is 2275 kg and the mass of car B is 1525 kg. From the skid marks and the data for the friction between the tires and concrete, the police determined that the cars , when locked together, hand a velocity of 31 km/h at an angle of 43 degrees North of the eastbound street. If the speed limit was 35 km/h on both streets:

a) should one or both cars be ticketed for speeding? Prove

b) Which car had the right of way at the intersection? Explain

c) Was one driver or both drivers at fault for the accident? Explain

Calculate the wavelength of Radio 4 which broadcasts on a frequency of 198, k, H, z,

198kHz.

2)     Izabela, a 10 year girl, asks for a red balloon for Christmas. Her father purchases a red balloon with ‘Merry Christmas Izzy’ written on it. Izabela blows the balloon into a 30.0 cm diameter balloon using helium gas. Assume the balloon is a sphere.

a.      Determine the buoyant force on the balloon.

b.      If the mass of the rubber balloon is 7.0 g, determine the net upward force on the balloon. Will the balloon rise?

You may assume that the density of helium is 1.28 kg/m³ and that .

2)     A rocket is launched straight up from Earth’s surface at 2100 m/s.

a.      By ignoring air resistance and considering the conservation of mechanical energy, determine the maximum height it reaches.

b.      What other information would be required to solve this problem in part (a) if air resistance is not ignored? How would your answer in part (a) change?

 A ball is dropped from rest and feels air resistance as it falls. Which of the graphs in Fig. Q5.26 best represents its vertical

velocity component as a function of time?

calculate the volume of the same mass of water at 300 degrees

Given that A=2i-3j+6k and B=i-2j+2k.find the scalar projection of B onto A

A 5 kg of ice cube at -10°C is mixed with 0.1 kg of water at 80 °C. There is no heat loss to the surrounding. The specific heat capacity of ice is 2.22 kJK-'kg-1,The specific heat capacity of water is 4.187 kJK-'kg-! . The specific latent heat of fusion of ice is 333 kJ kg-1. (a) What is the final physical state of the mixture?

A boy throws a ball upwards giving it an initial speed of 15m/s.neglect air resistance. How long does the ball take too return to the boy's hand