A certain car is capable of accelerating at a rate of 0.62 m/s2. How long does it take for this car to go from a speed of 25 mi/h to a speed of 47 mi/h?

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You know the initial velocity v_1, final veliocity v_2, and acceleration a. You will first need to convert the velocities from MPH to meters per second in order to have consistent units. Then solve for t.

At what temperature will the root-mean-square speed of oxygen molecules have the value of 640m/s ?
(1 kilo-mole of oxygen has a mass of 32kg).

A woman starts from her home at 9.00 am, walks with a speed of 5 km h–1 on a
straight road up to her office 2.5 km away, stays at the office up to 5.00 pm, and
returns home by an auto with a speed of 25 km h–1. Choose suitable scales and
plot the x-t graph of her motion.

A block of mass 5 kg is raised from the bottom of a lake to a height of 3 m without change in kinetic energy.if the density of the block is 3000kg/m3, then the work done is ?

You will need to determine the force required to lift the block, - which is equal to its weight minus the weight of water it displaces - and then multiply that force times the distance moved. If you're having difficulties show us your attempt and we'll help you along.

A plane increases at take off its velocity from 20 m/s to 100 m/s in 10 seconds. What is its acceleration

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Originally Posted by jgot2010

a plane increases at take off its velocity from 20 m/s to 100 m/s in 10 seconds. What is its acceleration

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it is change in accln divided by total time... ie (100-20) /10 = 8m/s^2

A ball traveling in a circle with a constant speed of 3 m/s has a centripetal acceleration of 9 m/s^2.What is the radius of the circle?

You need to memorize and use the relationhip between velocity under circular motion and acceleration:

If a ball is through on a inclined surface at an angle 48.6 degree , with the velocity of 30m/s . Whether it could travel a distance of 6m or not ? If not then what velocity should be given to the ball?

Hello Wagas. First, you should not tag a new question onto an old thread, but rather please start a new question instead. And second - I don't understand what you are asking; please clarify. Are you asking whether a ball with v = 30m/s has enough energy to roll up an incline a distance of at least 6 meters?

A seal swims toward an inlet with a speed of 5.0m/s as a current of 1.0m/s flows in the opposite direction. How long will it take the seal to swim 100.m?

You and your friend are playing racketball at the HPER. You are standing 7m from the wall , and you hit the ball towards it a 30 degree angle above the horizontal, with a speed of 15 m/s. The ball leaves the racket at a height of 1.5m. How long does it take to hit the wall

Try asking myphysicsbuddy.com. Its as good as a free homework help site!

A man 2m tall whose eye level is 1.84m above the ground looks at his image in a vertical mirror. What is the minimum vertical length of the mirror if the man is able to see the whole of himself? Indicate its position accurately in a diagram

1. Please don't tag a new question onto an old tread - you should start a new thread instead.

2. Draw a diagram with a sight line going from the man's eyes to the mirror and back to the man's feet, remembering that the angle of incidence equals the angle of reflection at the mirror. Note where the intesection of the sight line and mirror occurs. The answer will then be obvious.