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Calculate the momentum change for the box with mass m = 500 g during the delta time t = 0.5 s, when it is known that the coefficient of sliding friction is u = 0.1.
1. Calculate the impulse for the material point with mass m = 150 g, which moves with velocity V = 5 m / s, according to the south-north direction. Construct the pulse vector by applying the 1mm - 1 (kg m / s) arrangement
A butcher puts 10 kg of beef into a freezer. The initial temperature of the beef is 27 ̊C. After an hour, the temperature drops to χ ̊C. The amount of heat loss is -850 J. Given the specific heat capacity of the beef is 3.5 J/kg ̊C. Express the answer of χ in ̊C.
A body starts from rest and moves in a straight path with inform acceleration of 8m/s2 for 5meters , it then decelerate uniformly to rest in the next 10 seconds
The air temperature is 20 oC. A stationary observer sees a police car receding into the distance with a speed of 30 m/s with it’s siren blaring. If the police siren is designed to produce a sound of frequency 900 Hz, calculate the frequency of the sound heard by the stationary observer.
The air temperature is 20 oC. A stationary observer sees a police car receding into the distance with a speed of 30 m/s with it’s siren blaring. If the police siren is designed to produce a sound of frequency 900 Hz, calculate the frequency of the sound heard by the stationary observer.
Echoes are produced when a sound wave reflects off a surface and then returns to the source of the sound.
On the last day of semester 1, Ms L is outside and shouts “I’ll miss my physics students!” If the building off of which her sound wave reflected is 375 m away, how long will it take for Ms L to hear her echo? The speed of sound is 340 m/s.
To notify the workers on a farm that dinner is ready, a cook rings a triangle producing sound waves of frequency 1024 Hz. If it takes the sound 0.55 s to reach the farm workers, 190 m away, calculate the wavelength of the sound wave.
A kitchen sink is filled with water. A dripping kitchen faucet creates circular water waves along the water’s surface which travel at a speed of 0.042 m/s and have a wavelength of 0.05 m. How many drips strike the water’s surface in 12 s?
box of mass m is placed at the centre of a flat truck bed while the truck is moving at constant velocity VO . The truck bed has a length of L and its surface has a sliding friction coefficient μ. The truck then accelerates with a constant acceleration AO for a few seconds. Assume the origin O’ of the moving coordinate system coincides with the centre of the box and it is aligned perfectly vertically with the origin O of the static coordinate system on the road at the exact instant when the truck starts to accelerate and accidentally opens up its back doors. (assume the box as a particle and g = 10 ms-2)
a) Describe your system in detail and sketch the free-body diagrams (FBD) of the box when it is sliding and falling off the truck.
b) Write the equation of motion (EOM) of the box and its general solutions inside and outside of the truck.
c) Use relevant octave script provided to solve and plot the velocity and position of the box as a function of time.
d) Describe in detail the motion of the box based on the plots in part c)
