1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
topjm [15]
3 years ago
10

Answer key says b but i think it is false please help me

Physics
1 answer:
klasskru [66]3 years ago
5 0
Energy in a spring:

E = 0.5 * k * x²

k spring constant = 800 n/m
x stretch of the spring = 5 cm = 0.05 m

E = 0.5 * 800 * 0.05² = 1
You might be interested in
What is the block of 10 columns in the
LenKa [72]
B. transition metals for sure
7 0
3 years ago
The third floor of a house is 8m above street level. How much work is needed to move a 136kg refrigerator to the third floor?
jonny [76]

m = Mass of the refrigerator to be moved to third floor = 136 kg

g = Acceleration due to gravity by earth on the refrigerator being moved = 9.8 m/s²

h = Height to which the refrigerator is moved  = 8 m

W = Work done in lifting the object

Work done in lifting the object is same as the gravitational potential energy gained by the refrigerator. hence

Work done = Gravitation potential energy of refrigerator

W = m g h

inserting the values

W = (136) (9.8) (8)

W = 10662.4 J



8 0
3 years ago
A bullet is fired into the air at an angle of 45°. How far does it travel before it is 1,000 feet above the ground? (Assume that
Readme [11.4K]

Answer:

It travels 1414 feets.

Explanation:

Let's take the length the bullet travels <em>l </em>as the hypotenuse of a right triangle and the height it reaches one of its sides. Since we got the angle α at which it was fired and the height <em>h</em> it reached, we can calculate <em>l</em> using the <em>sin(α)</em> function:

sin(\alpha )=\frac{opposite side}{hypotenuse}\\sin(\alpha)=\frac{h}{l}\\l=\frac{h}{sin(\alpha)}

Replacing:

l=\frac{1000ft}{sin(\frac{\pi}{4})}

Solving and roundin to the nearest foot:

l=1414 ft

3 0
3 years ago
Amy is standing still on the ground; Bill is riding his bicycle at 5 m/s eastward; and Carlos is driving his car at 15 m/s westw
Solnce55 [7]

Answer:

20 m/s westward

Explanation:

Taking eastward as positive direction, we have:

v_B = +5 m/s is the velocity of Bill with respect to Amy (which is stationary)

v_C = -15 m/s is the velocity of Carlos with respect to Amy

Bill is moving 5 m/s eastward compared to Amy at rest, so the velocity of Bill's reference frame is

v_B = +5 m/s

Therefore, Carlos velocity in Bill's reference frame will be

v_C' = v_C - v_B = -15 m/s - (+5 m/s) = -20 m/s

and the direction will be westward (negative sign).

3 0
3 years ago
The drawing below shows two different types of pulley systems designed to lift a weight. In pulley system A, the end of the rope
nadya68 [22]
The answer would be in the chart or graph A is 1 B is 2
4 0
3 years ago
Read 2 more answers
Other questions:
  • What is the concentration of OH– ions at a pH = 6?
    5·1 answer
  • An individual electron can be thought of as a spinning sphere of negative charge. A charged spinning sphere will generate a magn
    7·1 answer
  • A hockey puck of mass m traveling along the x axis at 4.5 m/s hits another identical hockey puck at rest. If after the collision
    14·1 answer
  • Your car's 30.0 W headlight and 2.50 kW starter are ordinarily connected in parallel in a 12.0 V system. What power (in W) would
    15·1 answer
  • A positive point charge q is placed at the center of an uncharged metal sphere insulated from the ground. The outside of the sph
    12·1 answer
  • Olaf is standing on a sheet of ice that covers the football stadium parking lot in Buffalo, New York; there is negligible fricti
    15·1 answer
  • What would happen if the earth's continents moved closer together
    8·1 answer
  • When the chemical name of a compound is being written, the subscripts will determine the symbols. elements. prefixes. suffixes.W
    13·2 answers
  • An object elongates from a length of 45 cm to a length of 55 cm. The percent strain is
    12·1 answer
  • Ibrahim is experimenting with his circuits. He made a circuit using a 12V battery and 6.5 ohm resistor. But then he realized he
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!