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
strojnjashka [21]
2 years ago
15

please help with questions

Physics
1 answer:
kaheart [24]2 years ago
3 0

Answer:

Please selection one of the following

You might be interested in
A weightlifter raises a 200-kg barbell through a height of 2 m in 2.2 s. the average power he develops during the lift is
Lunna [17]
Power is calculated as work per unit time, and work in turn is calculated as force multiplied by distance. In this case, the force required is equivalent to the weight of the barbell multiplied by acceleration due to gravity.
P = W/t = Fd/t = mgd/t = (200 kg)(9.81 m/s^2)(2 m)/2.2 s = 1783.64 Watts.
4 0
3 years ago
Read 2 more answers
What simple machines combine to make a shovel which is a compound
IRINA_888 [86]
B) lever and pulley is the answer
6 0
2 years ago
Why is acceleration not constant near the speed of light
dmitriy555 [2]

Answer:

because when an object approaches the speed of light, it's mass starts to increase exponentially, and would be infinite at the speed of light. It would therefore require MORE than an infinite amount of energy to accelerate even a single electron to the speed of light

4 0
2 years ago
What is the difference between mass and weight?
Arturiano [62]

Answer:

mass: it is scalar quantity.

weight:it is a vector quantity.

3 0
2 years ago
A speeding car traveling at 24.8 m/s passes a police car that is at rest. The police car begins its pursuit at the instant the s
marusya05 [52]

Answer:

the acceleration required is 1.37m/s^2

Explanation:

The car is having a constant velocity movement, so if we calculate the time to reach 897m, we can use it to find the acceleration the policeman need to apply to reach the car.

x=v*t\\t=\frac{x}{v}\\t=\frac{897m}{24.8m/s}\\t=36.17s

the policeman is traveling with a constant acceleration starting from rest so:

x=\frac{1}{2}*a*t^2\\\\a=\frac{2*x}{t^2}\\\\a=1.37 m/s2

7 0
2 years ago
Other questions:
  • A 30 g particle is undergoing simple harmonic motion with an amplitude of 2.0 ✕ 10-3 m and a maximum acceleration of magnitude 8
    11·2 answers
  • Matthew throws a ball straight up into the air. It rises for a period of time and then begins to drop. At which points in the ba
    7·1 answer
  • You are on a frozen pond, and the ice starts to crack. if you lie down on the ice and begin to crawl, this will
    5·1 answer
  • The force on an object is F⃗ =−17j⃗ . For the vector v⃗ =2i⃗ +3j⃗ , find: (a) The component of F⃗ parallel to v⃗
    9·1 answer
  • Which of the following is a chemical reaction? A. A spoon bending B. Wood burning C. Plates being stacked D. A book being opened
    15·2 answers
  • A brick moves across a rough surface at constant velocity. Which of the following are forces that should be included in a free b
    6·1 answer
  • Two charged particles are projected into a magnetic field that is perpendicular to their initial velocities. If the charges are
    15·1 answer
  • Explain concept of donor levels and accepter levels in extrinsic semiconductors and How can Fermi level be defined for conductor
    12·1 answer
  • Hello I wanna know what is the Newton first is also called the law ​
    12·1 answer
  • Where do oils come from?<br><br> Bacteria<br> Plants<br> Fungi<br> Animals
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!