Physics, 27.03.2020 06:00 wolfsaway

Determine whether the objects in the following problems have kinetic or potential energy. Then choose the correct formula to use. KE = OR PE = m x g x h g= 10 m/s2

1. You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s. The ball has energy. Calculate it.

2. A baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby weights 12 N. The carriage has energy. Calculate it.

3. A car is traveling with a velocity of 40 m/s and has a mass of 1120 kg. The car has energy. Calculate it.

4. A cinder block is sitting on a platform 20 m high. It weighs 79 kg. The block has energy. Calculate it.

5. There is a bell at the top of a tower that is 45 m high. The bell weighs 190 N. The bell has energy. Calculate it.

Answers: 1

Show answers

Another question on Physics

Physics, 22.06.2019 09:00

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

Answers: 3

Answer

Physics, 23.06.2019 04:31

In which item is energy stored in the form of gravitational potential energy? a. a slice of bread b. a compressed spring c. an apple on a tree d. a stretched bow string

Answers: 1

Answer

Physics, 23.06.2019 10:10

Now that we have a feel for the state of the circuit in its steady state, let us obtain the expression for the current in the circuit as a function of time. note that we can use the loop rule (going around counterclockwise): e−vr−vl=0. note as well that vr=ir and vl=ldidt. using these equations, we can get, after some rearranging of the variables and making the subsitution x=er−i, dxx=−rldt. integrating both sides of this equation yields x=x0e−rt/l. use this last expression to obtain an expression for i(t). remember that x=er−i and that i0=i(0)=0. express your answer in terms of e, r, and l. you may or may not need all these variables. use the notation exp(x) for ex.

Answers: 1

Answer

Physics, 23.06.2019 16:00

Is the ability of one substance to dissolve in another.

Answers: 2

Answer

You know the right answer?

Determine whether the objects in the following problems have kinetic or potential energy. Then choos...

Questions