Homework Help for Physics

Consider the reaction of hydrogen gas and oxygen gas to form water. Determine how many moles of O2 are needed to react with 32 moles of H2.

The IMFA that connects pairs of nitrogenous bases in DNA is:

a.dipole-dipole      b. Ion -dipole     c.H-bonding d.ion-ion

Why firefly lights in darkness?Give the proper reason for this

The working principle of a washing machine is

A) reverse osmosis     B) diffusion     C) centrifugation     D) dialysis

How much is necessary to increase the internal energy of the He + ion , which is in the ground state , so that it can emit a photon corresponding to the H-a line of the Balmer series ?

( Balmer series ) :  656.3 nm ( red , or H-a ) ,

The fastest slapshot recorded was by Al lafrate in 1993 at 169.3 km/h. Assume this is the average speed of the puck as it travels from the blue line to the goal, a minimum distance of 18.3 m (60 feet). How long does the goalie have to react to the shot? (Average human reaction time is roughly 0.15 s)

Sound travels at 340 m/s. How long does it take the sound of a starter's pistol shot to travel 1.0 x 102 m?The Concorde, supersonic airliner cruises at 2500 km/h. How long does it take to fly from New York City to London England; a distance of 5150 km?

A car has an average highway speed of 90 km/h or 25 m/s. At this speed; how long will it take to drive to Kenora which is 190 km away? (Be sure to use common units.)

A hiker gets lost in a forest. He walks half-way around a circle with a radius of 2.1 km in 2.0 hours.

a) What distance did he walk?

b) What was his average speed?

c) What was his displacement?

d) What was his average velocity?

A car enters a tunnel at 24 m/s and accelerates steadily at 2.0 m/s2. At what speed does it leave the tunnel, 8.0 s later?

A body is traveling at 18.0 m/s and comes to rest after undergoing a uniform negative acceleration for 40.0 m.

a) What is the acceleration of this body?

b) How long does it take to come to rest?

The initial velocity of a body is 4.60 m/s. What is its velocity after 5.50 s if it (a) accelerates uniformly at 3.00 m/s2; and (b) accelerates uniformly at -3.00 m/s2?

A body moving with uniform acceleration has a velocity of 11.5 cm/s when its x coordinate is 5.0 cm. If its y coordinate 6.0 s later is -5.0 cm, what is its acceleration?

How long does it take an airplane, accelerating from rest at 5.00 m/s2, to travel 360 m?