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The truck is 10 km away from the dog and the width of the road is 15 km .
Will the truck hit or miss the dog ? Use calculations to support
- An object of mass 3kg moving with an initial velocity of 5i m/s² collides with and sticks to an object of mass 2kg with an initial velocity of -3j m/s². What is the velocity of the composite object
- A 30kg hammer strikes a steel spike of 2.3cm in diameter while moving with a speed of 20m/s². The hammer rebounds with a speed of 10m/s² after 0.11s. What is the average strain in the spike during this impact.
Five thick dictionaries each 10cm thick and each weighting 25N,are resting side by side flat on a table 1m high.how much work would be done against gravity to stack one on top of the other.
A string with free boundary caused by stationary waves. The distance of four adjacent nodes is 90cm. If the speed of wave propagation is 45m/s. the frequency of the wave is...
A door is 2.5m tall and 1.4m wide. It has a uniform density and weights 18kg. The door is supported
by two hinges, each 20cm from the top and bottom of the door as shown in the figure. A small child
weighting 30kg decides to start swinging from the doorknob which is 1m from the bottom of the door.
Find the total force (magnitude and direction) applied by each hinge on the door. Door knob is at the edge of the door.
- Calculate what mass of water can be changed to steam if 10.6kJ of heat energy is supplied to the water at 1000C. (Specific latent heat of vaporization of water = 2.26x106J/kg)
- Ammonia is vaporised in order to freeze an ice rink.
a) Find out how much heat it would take to vaporise 1 g of ammonia.
(Specific latent heat of vaporisation of ammonia = 1.34 x 106 J/kg Specific latent heat of fusion of ice = 3.34 x 105 J/kg).
A 20kg box is at rest on a friction less surface.then,a man pushed the box to a velocity of 3 m/s for 2 s
The moon Titan orbits the planet Saturn with a period of 1.9 × 106 s. The average radius of
this orbit is 1.6 × 109 m.
a) What is Titan’s centripetal acceleration?
b) What is Titans Velocity?
Mars has a radius of 3,390 km and a mass of 6.39 x 1023 kg.
a) What is the gravitational field strength on Mars?
b) How much would a 80kg person weigh on Mars?
Use the mass of the Earth as 6x1024 kg. A 250 kg satellite is in orbit around the Earth 150 km above the Earth=s surface. (Rearth = 6.38 x 106 )
A) What is the gravitational force felt by the satellite?
B) What is the centripetal acceleration?
C) What is the orbital speed of the satellite?
D) What is the satellites period in s? min? hr?
