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# Mia

Questions24
• ### Physics help?

How do I calculate the equivalent resistance?

• ### Physics help?

Mr. Smith is mowing his lawn and pushes the mower across his lawn at a constant speed with a force of 100 N. The lawn mower's handle makes an angle of 53 degrees with the negative vertical. If I push down the handle of the lawn mower and push it 5 meters way across my lawn in one direction, which of the following is closest to the work done by me on the mower?

a) 300 J

b) 400 J

c) 500 J

d) 664 J

e) Cannot be determined without knowing the force of friction on the mover

Physics1 year ago
• ### Physics help?

I find that my delicious hot tea in the morning is getting cold too fast. I always drink 200 mL of Earl Grey tea at a temperature of 70 degrees in each up, and my current cup is made from decorative glass. I want to change things so my tea stays warmer longer. Which of the following actions should I take to make this happen?

a) Putting my tea into a wider shorter cup

b) Using a cup with thinner walls

c) Using a solid steel mug

d) Use a chilled coaster for my mug that is 5 degrees cooler than the normal table

e) None of these actions will keep my tea warmer longer

• ### Physics help?

I pull a cart directly up a small incline as shown above. If I pull with 20 N directly up the hill, the cart moves 10 cm up the hill, and the incline is at 37 degrees above the horizontal. The work I do moving the cart uphill is closest to which of the following?

a) 1.6 J

b) 2.0 J

c) 160 J

d) 200 J

e) Cannot be determined without knowing the mass of the cart

• ### Physics help?

In a thundercloud there may be an electric charge of 37 C near the top and -37 C near the bottom. These charges are separated by approximately 2.3 km.

What is the magnitude of the electric force between them? The Coulomb constant is 8.98755E9 N*m^2/C^2

• ### How did the United States affect the outcome of ww2?

Can somone please write a paragraph explaining their position and three main reasons how the us affected the outcome & explain those reasons. Thanks.

• ### Physics question?

A 60 kg woman and her 40 kg son are standing at rest on an ice rink, as shown above. They push against each other for a time of 0.80 s, causing them to glide apart. The speed of the woman immediately after they separate is 0.50 m/s. Assume that during the push, friction is negligible compared with the forces the people exert on each other.

a) Calculate the speed of the son after the push

b) Calculate the magnitude of the average force exerted on the son by the mother during the push.

c) The woman continues gliding across the ice and runs into a force sensor coming to a complete stop. Find the impulse applied onto the woman by the sensor.

d) Using your understanding of momentum, explain how momentum is conserved in this system, The "initial" condition in the system is defined as the mother and son at rest and the "final" condition occurs after the mother and son begin to glide apart.

• ### physics help?

I am building a robot that uses a piston to support a very light weight arm. This arm is 100 cm long and must be ableto hold up a large box of mass 1.2 kg at the end. The piston is installed 10 cm from the hinge that the arm is on and applies a force straight upward. Which of the following is closest to the minimum force needed in the piston to keep the arm level?

a. 0.12 N

b. 8.3 N

c. 12 N

d. 83 N

e. 120 N

• ### physics help?

The owner's manual for my car states that the bolt that anchors my seatbelt mechanisms to the car frame should be tightened to a torque of 14 Nm. I have a wrench whose handle is 15 cm long. If I can push with a force of 100 N and push at 90 degrees to the handle, where should I put my hand on the handle to achieve this torque (with a distance of zero meaning I am at the bolt)?

• ### Physics help?

Two identical (same mass and shape) balls of clay are flying through the air. Ball A is moving to the right at 4 m/s, while ball B is moving left at 3 m/s. They collide in a perfectly inelastic collision. What is the velocity of the resulting mass (positive is to the right)?

• ### Physics help?

I hang a meter stick from the ceiling with a string at the 50 cm mark and it balances properly. I hang an unknown mass on the stick at the 35 cm mark, causing the stick to tilt. I move a 100 g mass along the meter stick until I get the stick to balance out. The 100 g mass ends up at the 83 cm mark when the stick is balanced. What is the unknown mass?

a. 45.5 g

b. 94.3 g

c. 100 g

d. 220 g

e. 553 g

• ### Help with this physics problem?

A 90.7 W bulb is connected to a 130 V

source.

1. A lamp dimmer puts a resistance in series

with the bulb.

What resistance would be needed to reduce

the current to 0.45 A?

• ### Physics help - bridge question?

A bridge of length 65 m and mass 49000 kg is

supported at each end (points A and B on the

picture below). A truck of mass 36000 kg is

located 21 m from the left support A.

Calculate the normal force on the bridge at

point B (the right support). The acceleration

of gravity is 9.8 m/s.

Calculate the normal force on the bridge at

point A (the left support)

• ### physics question help?

A 704 N window washer is standing on a scaffold supported by a vertical rope at each end.

The scaffold weighs 141 N and is 4.37 m long.

Assume the window washer stands 1.4 m from

the left end.

What is the tension in the rope on the right?

What is the tension in the rope on the left?