3273

Physics Work,Power & Energy Level: High School

energy

Two objects have the same kinetic energy . if the speeds of the objects are in the ratio 3:1 the ratio the ratio of their masses is ?



3272

Physics Work,Power & Energy Level: High School

Power

The power rating of an engine is 5.0 kW. What is the horsepower of the engine ?



3271

Physics Force & Laws Of Motion Level: High School

Impulse

A 300 g baseball traveling at 30 m/s is struck by a bat in the direction from which it came at 40 m/s find the impulse of the force on the baseball ?



3270

Physics Work,Power & Energy Level: High School

collision

A 3 kg bowling ball traveling with a velocity of 3 m/s collides head on with another bowling ball of the same mass traveling with a velocity of -2 m/s . If the collision is perfectly elastic the velocity of the bowling balls after the collision are ?



3269

Physics Work,Power & Energy Level: High School

Collision

An object with a mass of 2 kg traveling with a velocity of 3 m/s collides head on and elastically with a stationary object of mass 0.5 kg . The velocity of the 2 kg mass after the collision is ?



3268

Physics Rotational Mechanics Level: High School

Centre of Mass

The coordinates of three particles are (5,7) (0,3) and (-1, -1). If the three particles have 1.0 kg , 2.0 kg and 2.0 kg respectively , find the coordinates of the center of mass .



3267

Physics Force & Laws Of Motion Level: High School

The magnitude of the momentum of a particle is 32 kg m/s at a certain instant . If the velocity has a magnitude of 20 m/s at that instant , What is the mass of the particle ?



3266

Physics Waves And Oscillations Level: High School

In the equation E = hf , the f stands for .

a) frequency characteristic of quantum phenomenon .

b) the smaller wavelengths of visible light .

c) wave frequency .

d) none of these .

wave frequency



3265

Physics Ray Optics Level: High School

Colors seen when gasoline forms a thin film on water are a demonstration of

a) polarization .

b) refraction .

c) dispersion .

d) interference.

e) reflection .

interference.



3264

Physics Force & Laws Of Motion Level: High School

When an alpha particle is ejected from a nucleus , the nucleus then has less

a)mass

b) charge

c) both of these

d) neither of these




3263

Physics Waves And Oscillations Level: High School

On a day when the wind is blowing 39.5 km/hr from east to west , a fire engine is headed toward you from the west at 105 km/hr and you are headare headed toward the fire engine at 92.4 km/hr. If the engine has a 1460 Hz siren and the speed of sound is 340 m/s , What frequency do you hear ? Answer in units of Hz .



3262

Physics Waves And Oscillations Level: High School

An ambulance is traveling North at 60.7 m/s , approaching a car that is also traveling North at 30.6 m/s . The ambulance driver hears his siren at a frequency of 959 cycles / s . At what frequency does the driver of the car hear the siren ? Answer in units of m .



3261

Physics Waves And Oscillations Level: High School

Earthquakes produce two kinds of seismic waves : The longitudinal primary waves (called P waves) and transverse secondary waves (called S waves) . Both S waves and P waves travel through Earth’s crust and mantle , but at different speeds : the P waves are faster than S waves , but their exact speed depend on depth and location . Assume the P waves speed to be vp = 8580 m/s while the S waves travel at a slower speed of vs = 5570 m/s . Suppose a seismic station detects a P wave and then ^t = 93.5 s later detects an S wave . How far away is the earthquake center ? Answer in units of km .



3260

Physics Waves And Oscillations Level: High School

The time needed for a water wave to change the equilibrium level to the crest is 0.5242 s .

a) What fraction of a wavelength is this ?

b) What is the period of the wave ? Answer in units of s .

c) What is the frequency of the wave ? Answer in units Hz .




3259

Physics Waves And Oscillations Level: High School

A sonar signal of frequency 2.12 x 10 to the 6 Hz has a wavelength of 1.71 mm in water .

a) What is the speed of the signal in water? Answer in units of m/s .

b) What is its period in water ? Answer in units of s .

c) What is its period in air ? Answer in units of s .


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