Recent questions and answers in Physics

Recent questions and answers in Physics

How far should pencil held from a convex mirror of radius 80 cm to form an image one-half the size of the pencil?

Tanner Semerad answered Jan 4

by Tanner Semerad

8.6k points

1 answer

4 votes

37.3k views

Larvae and pupae normally float. They must use their muscles in order to dive down through water. What type of energy is used by the muscles? O Sound energy from the air O Thermal energy from the water

Iamalismith answered Jan 4

8.3k points

1 answer

3 votes

3.7k views

Using your data, after finding initial velocities, how far does a rocket travel if its initial time was 1 second? A) 1 kilometer B) 2 kilometers C) 3 kilometers D) It depends on additional factors

DerpyNerd answered Jan 4

7.8k points

1 answer

5 votes

112k views

The half-life, t, for a particular radioactive element is ______ min. Find the decay rate of the element.

ItsMasoud answered Jan 4

8.7k points

1 answer

5 votes

223k views

Vacuum contacts A. Are quieter in operation than standard contactors B. Can control higher voltages in a smaller space C. Are more economical to purchase than conventional contactors D. Require the connection

David Rasuli answered Jan 4

by David Rasuli

8.4k points

1 answer

4 votes

205k views

A wire 100 cm long is bent to form a triangle. The middle-sized side of the triangle is 2 cm longer than one side and 6 cm shorter than the other side. What are the lengths of the three sides? a) 20 cm,

Warren Blanchet answered Jan 4

by Warren Blanchet

7.9k points

1 answer

1 vote

28.4k views

A bucket that weighs 5 lb and a rope of negligible weight are used to draw water from a well that is 70 ft deep. The bucket is filled with 38 lb of water and is pulled up at a rate of 2.5 ft/s, but water

Domnic answered Jan 4

by Domnic

8.2k points

1 answer

1 vote

123k views

A long pipe is connected to a tank. Water flows through the pipe at 10 km/hr to fill 2200 m³ of the tank in 7 hours. What is the radius of the pipe? (a) 0.25 m (b) 0.50 m (c) 0.75 m (d) 1.00 m

Ruudjah answered Jan 4

9.1k points

1 answer

4 votes

41.1k views

a force of f=20x−x3n stretches a nonlinear spring by x meters. what work is required to stretch the spring from x=0 to x=3m ?

Luis Pereira answered Jan 4

by Luis Pereira

7.9k points

1 answer

0 votes

191k views

If a 6-kilogram mass is dropped, it will strike the ground with a force of 58.8 newtons. Use Newton's Second Law of Motion to find the rate of acceleration."

PoPaTheGuru answered Jan 4

8.2k points

1 answer

5 votes

199k views

A musician hits a drum with a drumstick. In three to four sentences, explain the collision forces between the drum and drumstick. Help needed!

JBildstein answered Jan 4

7.9k points

1 answer

2 votes

234k views

if a person pushes the 5 kg door with 7 N of force, what is the acceleration of the door when it opens?

Benelgiac answered Jan 4

7.9k points

1 answer

1 vote

105k views

A vector makes an angle,��, with the horizontal. The horizontal and vertical components of the vector will be equal in magnitude if angle�� is? 1) 30 degrees 2) 45 degrees 3) 60 degrees 4) 90 degrees

Jonua answered Jan 4

by Jonua

7.9k points

1 answer

0 votes

83.4k views

A 70 kg astronaut is moving at 12 m/s and collides with a 60 kg astronaut moving at -5 m/s. What is the total momentum of both astronauts before they collide? a) 840 kg·m/s b) 180 kg·m/s c) -240 kg·m/s

Petre Popescu answered Jan 4

by Petre Popescu

7.8k points

1 answer

0 votes

51.9k views

A stack thermometer commonly has a range from a. 0 to 500°F b. 300 to 500°F c. 200 to 1,000°F d. 500 to 1,000°F

Andrew Beals answered Jan 4

by Andrew Beals

9.0k points

1 answer

0 votes

164k views

romeo is throwing pebbles gently up to juliet's window, and he wants the pebbles to hit the window with only a horizontal component of velocity. he is standing at the edge of a rose garden 8.0 m below

Loki answered Jan 4

by Loki

9.0k points

1 answer

1 vote

27.0k views

The vertex of the parabola below is at the point (2,-4). Which of the following could be this parabola's equation? A. y = x² B. y = (x - 2)² - 4 C. y = 4x² + 4 D. y = (x + 2)² + 4

Steve Amerige answered Jan 4

by Steve Amerige

8.3k points

1 answer

5 votes

207k views

A bucket of water (m=2.0 kg) is attached to a 0.80-m long string and spun in a vertical circle. The speed of the water at the bottom of the circular path is 6.0 m/s. (a) What is the force of gravity? (b)

Lillemets answered Jan 4

8.7k points

1 answer

5 votes

165k views

Describe the postulate on which Einstein based the theory of general relativity and describe an everyday experience that illustrates this postulate. A. Gravity and velocity have the same effect and cannot

PermanentGuest answered Jan 4

by PermanentGuest

7.9k points

1 answer

0 votes

139k views

A man travels 7.0km due north, then 10.0km east. Find the resultant displacement..

Lansana Camara answered Jan 4

by Lansana Camara

8.2k points

1 answer

5 votes

20.4k views

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