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
GaryK [48]
3 years ago
5

a person does 100 joules of work in pulling back the string of a bow. what will be the initial speed of a 0.5 kg arrow when it i

s fired from the bow?
Physics
1 answer:
eduard3 years ago
3 0

If all the energy she put into bending the bow is completely
transmitted to the arrow, then the arrow has the 100 joules
of kinetic energy when it leaves the bow.

                 Kinetic energy = (1/2) (mass) (speed)²

                         100 J        = (1/2) (0.5 kg) (speed²)

Divide each side by 0.25 kg:    100 J / 0.25 kg = speed²

 [ joule ] = [ newton-meter ] = kg-m²/sec²

                                                100 kg-m²/sec² / 0.25 kg = speed²

                                                 400 m²/sec² = speed²

Take the square root of each side:     speed = √400 m/s

                                                                                20 m/s

                                                                    (about 44.7 mph)                                           

You might be interested in
Why are there so few working wave power stations?
Bond [772]
Well mostly because it's for oceans and lakes that have waves. so if you don't live near any of these, you wouldn't be getting power. <span />
3 0
4 years ago
Read 2 more answers
I need help with #4 and #5?
algol [13]

A

Explanation:

just  pick a

3 0
3 years ago
The electric field due to two point charges is found by: a) finding the stronger field. The net field will just be equal to the
alekssr [168]

Answer:

b)determining the electric field due to each charge and adding them together as vectors.

Explanation:

The electric Field is a vector quantity, in other words it has a magnitude and a direction. On the other hand, the electric field follows the law of superposition. The electric field produced by two elements is equal to the sum of the electric fields produced by each element when the other element is not present. in other words, the total electric field is solved determining the electric field due to each charge and adding them together as vectors.

7 0
3 years ago
Calculate the number of moles of water molecules in 12 dm' of water<br>vapour at STP.<br><br>​
Vinvika [58]

Answer:

22.4 \:  {dm}^{3}  \: are \: occupied \: by \: 1 \: mole \\ 12 \:  {dm}^{3}  \: will \: be \: occupied \: by \: (  \frac{12}{22.4} ) \: moles \\  = 0.536 \: moles

4 0
3 years ago
Which phrase describes the thermal energy of a sample of matter?
fiasKO [112]

Answer:

where are the phrase's?

5 0
3 years ago
Other questions:
  • A particle moves along the x axis. Its position is given by the equation
    13·1 answer
  • Please help me with my physics I don’t understand! Please provide work.
    8·1 answer
  • A 10 kg body is suspended by a rope is pulled
    14·1 answer
  • A speed boat travels from the dock to the first buoy a distance of 20 meters in 18 seconds it began the trip at a speed of 0 m/s
    15·1 answer
  • we see a magnet exerting a force on a current-carrying wire. Does a current-carrying wire exert a force on a magnet? Why or why
    9·2 answers
  • Because of convection, the warmest air in a room
    11·1 answer
  • The heaviest invertebrate is the giant squid, which can have a weight of about 1.7 tons spread out over its length of 68 feet. w
    6·1 answer
  • The Mandalorian tells baby Yoda (Grogu) to put on his seatbelt in his ship the Razor Crest. Explain why is it a good idea to hav
    7·2 answers
  • A ventilating fan is operated by 0.5hp electric motor. How much work in joules can the fan do in 3 hours? (I need the answer asa
    6·1 answer
  • The main reason that rods are more sensitive to light than cones is that
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!