Hey Guys... I'm having some difficulties with the following:
For which of the following is kinetic energy converted into potential energy?
A)a boulder rolls down a hill
B)a ball is thrown upward
C)a swing comes to a stop
D)a bowling ball rolls horizontally
The gravitational potential energy of an object changes when which of the following changes?
A)the objects speed
B)the objects mass
C)the objects temperature
D)the objects length
Friction causes mechanical energy to be transformed into which of these forms?
A)Thermal
B)nuclear
C)kinetic
D)potential
The kinetic energy of an object changes when which of the following changes?
A)the objects chemical potential energy
B)the objects volume
C)the objects direction of motion
D)the objects speed
When an energy transformaion occurs, which of the following is true?
A)Mechanical energy doesn't change
B)Mechanical energy is lost
C)The total energy doesn't change
D)Mass is converted into energy
Can someone explain to me why the law of conservation of energy must also include changes in mass?
hey guys... why do the tires of a car get hot when the car is driven?
On a cold day you rub your hands together to make them warm. How can I diagram the engery transformations that occur? starting with the chemical potential energy stored in your muscles.
What is the kinetic energy of a 0.06-kg tennis ball traveling at a speed of 150 m/s?
Hey... If a boulder with a mass of 2,500 kg rests on a ledge 200 m above ground. What is the boulder's potential energy?
What is the mechanical energy of a 500-kg rollercoaster car moving with a speed of 3 m/s at the top of a hill that is 30 m high?
UGHHHHHHHHH!... If a boulder with a mass of 2,500 kg on a ledge 200 m above the ground falls. If the boulders mechanical energy is conserved, what is the speed of the boulder just before it hits the ground?Can someone help me with Physcis??I can also give you the advice which other answerers have given . But I shall give you answers and leave explanations for you to discover.
Q.1 b), Q.2 b), Q.3 a), Q. 4 d), Q.5 c)
Because scientists have found that mass and nerg are equivalent So they generalized the law as massenergy conservation.
Due to frictional force by the road on tyre also act on road and make it hot but the road is too big to notice it and tyre is tiny compared to road
Chemical t kinetic to thermal through friction
Kinetic energy of ball =1/2mv^2 = 0.5x0.06x150^2 = 675 J
Potential energy = mgh = 2500x9.8x200 =4900 kJ
KE + PE = 0.5x500x3^2 + 500x9.8x30 = 2250 + 147000
= 149.25 kJ
2500x9.8x200 = 0.5x2500xv^2 or 1960/0.5 = v^2 = 3920
or v = 62.60 m/sCan someone help me with Physcis??Go read your book and do your homework. If you have a question or two or even three, ask it.Can someone help me with Physcis??I suggest you open your book and read on the corresponding subject matters. Honestly, if you have time to post this %26quot;long%26quot; question in the Internet and consequently, read/understand/digest whatever replies you will solicit from your post, then you should have ALL THE TIME to read your book.Can someone help me with Physcis??B. B. A. D. Because mass is converted to energy and visa-versa. Because the compression and decompression of the rubber causes friction. You'll have to look the others up.
