Physics

If the wavelength of an electromagnetic wave is about the atomic nuclei, what type of radiation is it? a.Microwave b.Visible light c.Gamma ray d.Radio wave e.Wavelengths can't be that small.

Gamma ray

A car is moving on a highway with a speed of 100 m/s. Twoseconds later the car is moving at 10 m/s in the same direction. The car's acceleration is 𝐴𝑐𝑐𝑒𝑙𝑎𝑟𝑎𝑡𝑖𝑜𝑛=𝐹𝑖𝑛𝑎𝑙𝑣𝑒𝑙𝑜𝑐𝑖𝑡𝑦−𝑖𝑛𝑖𝑡𝑖𝑎𝑙𝑣𝑒𝑙𝑜𝑐𝑖𝑡𝑦𝑇𝑖𝑚𝑒𝑖𝑛𝑡𝑒𝑟𝑣𝑎𝑙=10−1002= -45m/s/s a.-50m/s2 b.-45m/s2 c.+45m/s2 d.+30 m/s2

b.-45m/s2

Speed is

b.a scalar quantity

The scientific method is: a.ways scientistmake problems and ask questions b.ways scientists answer questions and solve problems c.ways scientists never solve problems d.ways kids play out door games

b.ways scientists answer questions and solve problems

A ball is thrown straight up. It reaches its highest point and then falls back. Which of the following is the correct statement? a.Throughout its motion, the ball's velocity is zero. b.At the highest point in its motion, the ball's acceleration is zero .c.At the highest point in its motion, the ball's velocity is zero. d.Throughout its motion, the ball's acceleration is zero .e.At the highest point in its motion, the ball's velocity and acceleration are zero.

At the highest point in its motion, the ball's velocity is zero.

Which of the following statements about velocity and/or speed are TRUE? .There is no difference, they are both vectors ii.Velocity is a vector quantity and speed is a scalar quantity .iii.The phrase "30 mi/hr, west" likely refers to a scalarquantity. iv.There is no difference, they are both scalars

Velocity is a vector quantity and speed is a scalar quantity

What are the properties of visible light waves? a.Frequency b.Wavelength c.Speed d.a, b and c

a, b and c

What is the difference between distance and displacement? a.Displacement is a vector and distance is a scalar b.There is no difference, they are both scalars c.There is no difference, they are both vectors d.Displacement is a scalar and distance is a vector

a.Displacement is a vector and distance is a scalar

A ball rolls in a straight line along the horizontal direction. Using motion diagram (multiflash photo graphs) describe the velocity and acceleration of the ball for each of the following situations: a.The ball moves to the right at a constant speed b.The ball moves to the right at a higher constant speed then at zero meters it is slowing down at a constant rate and after 3 meter mark it move with a low constant speed. c.The ball moves from right to left and continually slows down. d.The ball moves from right to left and continually speeds up. e.The picture is not clear.

a.The ball moves to the right at a constant speed

Velocity is

a.a vector quantity

Using a pedometer, you walk 3000 steps in 20 minutes, so your speed is 150 steps/min. Each of your steps is 0.7 m long. What is your speed? 1 hour is 3600 seconds, 1 minute is 60 seconds Speed = 150 steps/min1 step = 0.7 m150 steps = 150 x 0.7 = 105 metersSpeed = 105 meters/min a.155steps per min b.7.5miles per hour c.214metersper min d.105metersper min e.2.5metersper second

d.105metersper min

When you look at the speedometer in a moving car, you can see the car's: a.average distance traveled. b.instantaneous acceleration. c.average speed. d.instantaneous speed. e.average acceleration.

d.instantaneous speed.

The velocityof a body is given by the slope of a graph plotting a.distance travelled versus timeb.time versus velocity.c.velocity versus distance travelled.d.velocity versus timee.displacementversus time.

displacement versus time.