khuong

11×11×11=?

The working principle of a washing machine is

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

___C4H8 (g) + ____O2 (g) ---> ____CO2 (g) + _____ H2O (g)

(Balance)

Which is the better deal

$50.00 for a pack of 8

$55.00 for a pack of 10

A 100 kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 200 N. For the first 15 m the floor is frictionless and for the next 15 m the coefficient of friction is 0.15. *

What is the final speed of the crate?

A. 8.72 m/s

B. 4.23 m/s

C. 9.12 m/s

D. 2.31 m/s

A man stands on a tall ladder of height h. He leans over a little too far and falls off the ladder. If his mass is m, what is his kinetic energy right before he hits the ground?

A. 1 mgh

B. 1/2 mgh

C. 2 mgh

3 bulbs each of resistance 8 Ohm are connected in series. The circuit has a voltage source of 12 volts. Find: 1) the total resistance of the circuit 2) the current flowing through each bulb

Choose all applying options.

A. Req=240

B. 1=2A

C. 1=0.5A

D. Req=360

Nuclear sizes are expressed in a unit named

The lowest temperature is recorded by:

How many atoms of carbon are present in 2.592 moles of carbon tetrabromide?

Please write your answer in scientific notation such that 1x 104 is written as 164.

If an excess water is present how many moles of O2 are generated by photosynthesis of 2.93 mol Co2

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)

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?

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

9. A runner accelerates uniformly form rest at 1.40 for 8.00s

a) What is her final velocity?

b) What is her average velocity

c) How far does she travel?

10. A car accelerates from rest at 6.65  . How far does it get between 10.0 and 14.0 s?

1. -2 ; 33.8 m        2.  61.4 m ; 3.02 s          3.  12 s         4. -4.4         5. 21.1 m/s ; -11.9 m/s       6. 21.9 s ; no, it reeds 1.26 km to land.         

7. -4.05 ; 4.44 s          8.  40 m/s           9. 11.2 m/s ; 44.8 m          10. 319 m

A cyclist is traveling at 12.0 m/s when he applies the brakes and begins to slow. After.4.5 s the cyclist has slowed to 3.0 m/s. What was the cyclist's (a) acceleration (assume it was constant)?, and (b) the distance traveled in this time?

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 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 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.)

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?

High speed increases the risk of collision because of all these factors except

1. Traction is reduced

2. Visibility is increased

3. Force of impact is greater

4. Inertia is increased to stop the vehicle

Speed is the ratio of the distance an object moves to______
A. Amount of the time object moves

B. The direction an object moves

C. Velocity at which object moves

D. None of these

Assume that a particle is moving with a certain angular velocity. What will be the linear velocity of the particle if the radius becomes double?

What are the units of measurement for tangential speed and rotational speed?

If you walk towards a mirror at a certain speed, the relative speed between you and your image is______

1. Same as your speed

2. Doubled of your speed

3. Tripled of your speed

4. independent on your speed

Which of the following is true regarding the speed of light?

1. The speed of light varies in space with the wavelength

2. The speed of light increases when it travels through matter

3. It is constant for all electromagnetic waves traveling in a vacuum

4. Its value is 200000 km/hr

What is the speed of a wave with a wavelength of 3 m and a frequency of  0.1 Hz?

On Jerry's text messaging phone plan, she paid $0.30 for every 30 messages she sent. 
What is the her cost per message?

On Jerry's text messaging phone plan, she paid $0.30 for every 30 messages she sent. 
What is the her cost per message?

3^(4)÷3^(2)

How do I get to find the answer?

let a = {1, 2, 3, 4, 5} and b = {2, 4}. What is a ∩ b?

19. If the two triangles shown below are similar based on the given information, complete the similar statement. Write "not similar" if not similar.

WHAT IS 4+3?

WHAT IS 5-7

WHAT IS 4*7?

WHAT IS 5*9?