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The velocity of a 2kg object increases from 2.0m/s to 4.0m/s by a constant force. Find the change in momentum of the object. Show complete solution.
Find the momentum of a 100kg object travelling at a speed of 20m/s. Show complete solution.
A roller coaster ride in a park includes a vertical drop of 60m. Assume that the roller coaster has a speed of nearly zero when it reaches the top of the hill. Neglected friction, find the speed of the riders at the bottom of the hill. Show complete solution.
A 5m rope is tied to a tree limb and used as a swing. Tarzan holds the rope in horizontal orientation. Assuming that the frictional force is zero and there is no air resistance, determine the speed of Tarzan at the lowest point on the circular arc of the swing. Show complete solution.
A cyclist is trying to leap across two hills by cycling horizontally of the taller hill. The cyclist leaves the taller hill at a speed of 40m/s. Ignoring the air resistance, find the final speed with which the cyclist strikes the ground in the other hill. Show complete solution.
According to the infographic above a recent magnitude 6.1 Earthquake was recorded. Earthquakes represent a release of energy as a result of the earth's tectonic plates. a) Determine the amount of energy release in ergs. b) Determine the energy release in Joules. ( Hint use the earthquake formula M = 2/3 log (E/ 10^11.8); where M is the earthquake magnitude and E is the energy of the earthquake in ergs (recall 1 erg = 10^-7 Joules)). c) Using the earthquake magnitude scale below to qualitatively categorize (was it Minor, Light, Moderate, Strong, Major or Great) and describe the earthquake (what kind of damage is expected from a magnitude 6.1 earthquake).
An electric heater raises the temperature of 120g of water, in a thin light vessel through 10k in 2mins when placed in 70g of water contained in a metal vessel of mass 0.55kg the temperature raises through 9k in the same time. Calculate from the above
a.The heat suppliedin 2mins by the heater?
b.The power of the heater?
c.The heat supplied to the 70g of water?
d.The heat supplied to the metal vessel ?
e . The heat capacity of it's material (specific heat capacity of water=4200j-¹k-¹)?
No2: when two objects P and Q are supplied with the same quantity of heat the temperature change in P is observed 70 be twice that of Q. The mass of P is half that of Q.The ratio of the specific heat capacity of P to Q is?
4. A spaceship racing towards Jupiter at 0.70c launches a probe towards the planet at a relative speed of 0.50c. How fast will the probe approach Jupiter as measured by the observer on that planet?
A. 1.4 c
B. -3.3 c
C. 0.89 c
D. 0.78 c
5. An astronaut journeying to the nearby star Alpha Centauat at a speed of 0.99 c relative to the Earth requires 8.57 Earth years to complete hertrip How many years as measured on earth to complete her trip?
A. 1:21 years
B. 60.75 years
C. 5 years
D. 50 years
1. Which of the following describes the speed of light according to the Special Relativity Theory?
A The speed of light is constant.
B. The light speed depends on the speed of the observer.
C The speed of light depends on the source.
D. The speed of light is infinite
2. One of two identical twins became an astronaut, while the other worked at PAGASA. The astronaut had a journey to a nearby star and has been gone for several years. Upon the astronauts return, the twins reunite and observe their physical appearances. The result will be that
A. The astronaut has aged less
B. The one working in PAGASA has aged less
C. Both have aged the same
D. None of the above
3 A man on the ground sees a rocket moving past him at 99% the speed of light. Compared to when the rocket is at rest, the man measures the length as:
A. Longer
B. Shorter
C. The same length
D. None of the above
1. Radio signals from a distant planet are received at a frequency of 106 MHz on a spaceship headed directly toward the planet at a speed of 0.30c. What is the frequency of the radio signal as measured on that planet?
2. The red light emitted by a hydrogen has a wavelength of 550 m measured in the laboratory. An astronomer studying a distant star observes light at a longer wavelength which he believes is hydrogen light that has been Doppler-shifted because of the star's motion. If the observed wavelength is 754 mm, is the star moving toward or away from him?
