edgenuity physics cumulative 1

Which BEST describes why Alpha decay emissions are more easily stopped and don't penetrate easily?

• Light released from Alpha decay has less energy than light released from gamma decay

• Alpha decay releases particles that have a lower mass than the particles released during beta decay

• Alpha decay releases particles that have a lower mass than those released from gamma decay

• Alpha decay releases particles that have a higher mass than those released from beta decay

What are you trying to reduce by wearing sunscreen?

• The likelihood of random effects, such as DNA mutations

• The likelihood of random effects, such as cancer

• The severity of non-random effects, such as cancer

• The severity of non-random effects such as radiation sickness

A 3 kg block is attached to a spring that is pulled back by 1.2 meters. The spring has a force constant of 60 N/m. The spring is released and the block moves forward and detaches from the spring. Assume that the block starts with just elastic potential energy and ends ups with just kinetic energy. How fast in m/s will the block be moving when it has just kinetic energy? Round to the nearest tenth.

5000 J of wind energy is available to a wind turbine. 1000 J is converted into electricity. What is the % efficiency of the wind turbine?

Which statement about the pendulum is true?

• Gravitational potential energy is transformed into kinetic energy from D to C

• Gravitational potential energy is transformed into kinetic energy from C to B

• Kinetic energy is transformed into gravitational potential energy from E to D

• Kinetic energy is transformed into gravitational potential energy from A to B

A light bulb starts off with electrical energy that is transformed into 30 J of heat and 120 J of light energy. How many Joules of electrical energy did it start with?

What is the kinetic energy in Joules of a 600 kg unicorn that is running at 8 m/s?

A rubber band is stretched so that it has 7.5 Joules of elastic potential energy. If it's force constant is 60 N/m, what is the displacement in meters? Round to the nearest tenth.

In which example was the most amount of work done on a box?

• Using 20 N to move it 3 meters

• Using 25 N to move it 2 meters

• Using 40 N to move it 1 meter

• Using 22 N to move it 2.5 meters

Which statement is true of the object shown that has uniform circular motion?

• The green arrow is the force, and the black arrow is direction of movement for that moment

• The green arrow is the direction of movement for that moment, and the black arrow is the force

• The green arrow will always point to the left as the object keeps moving in a circle

• The black arrow will always point up as the object keeps moving in a circle