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The magnetic force that earth exerts on a compass needle is less than the force that the compass needle exerts on earth.
A. True
B. False
State a hypothesis that would explain why a tennis ball, racquetball, ping pong ball, and golf ball bounced different heights when starting at one meter.
Calculate the index of refraction at 29° and 30°
PP1//1
Two identical conducting spheres, one that has an initial charge +Q, the other initially uncharged, are brought into contact. What is the new charge on each sphere?
(a) +Q
(b) +Q/2
(c) zero
(d) -Q/2 (e) -Q
The electric motor of a model train accelerates the train from rest to 0.620 m/s in 21.0cs. The total mass of the train is 875 g. Find the average power delivered to the train during the acceleration.
The guitar string wire in item 2 was 1.60 m long with a diameter of 0.20 cm. Approximately what tension force would break it?
A man travels due north in order to cross a river 5km wide following due East as 3km/h.If he can row at 10km/h in still water.How far from his destination will he land if he ignorantly steers northward
block of mass 2.25 kg starts out at the rest at the top of 15.0 m long plane inclined 30° with horizontal .a)what is its initial gravitational potential energy.? as.it slides down the plane,the block encounters.frictional force at 3.5n. b)how much work is done to overcome.friction. c)what is the kinetic energy of the block when it reaches the bottom od the incline?at a distance of .5m from the bottom of the inclined plane is horizontal.spring of the force constant 52n/m. suppose that the coefficient of kinetic friction between the block and the horizontal surface is 0.15? d)what is the kinetic energy of the block just before it comes in contact with the spring? e)by how much will the springbe compressed? f)what is the work done against friction as the block moves along the horizontal surface? is
The guitar string wire in item 2 was 1.60 m long with a diameter of 0.20 cm. Approximately what tension force would break it?
Masking tape and ruler/ tape measure
Procedure:
1. Mark a starting point and place marks along a straight path at 10 cm, 40cm,
90 cm, 160 cm, and 250 cm from the start.
2. Clap a steady beat. On the first beat, the person walking the course should
be at the starting point. On the second beat, the walker should be on the
first mark, and so on.
3. Repeat step 2 while starting at the other end.
Think about It:
1. What happened to your speed as you move along the course? Infer what
would happen if the course were extended farther.
2. On your way back what happened to your speed?
