# Physics

30Jan

### Today, Earth’s magnetic field is losing approximately 7 percent of its strength every 100 years. If the strength of Earth’s magnetic field at its surface is 0.5 gauss today, what will it be 100 years from now?

danielleopher78 Physics 1 0
30Jan

### You go to another forest and measure the shadow of a tree as being 6 meters long. The shadow of your meter stick is 2 meters long. How tall is the tree?

laurendooley Physics 1 0
30Jan

### One light beam has wavelength, λ1, and frequency, f1. Another light beam has wavelength, λ2, and frequency, f2. Write a proportion that shows how the ratio of the wavelengths of these two light beams is related to the ratio of their frequencies.

Sandra111 Physics 1 0
30Jan

lucc Physics 1 0
30Jan

### A hydrogen atom has one proton, two neutrons, and no electrons. Is this atom neutrally charged? Explain your answer.

mallsup19 Physics 2 1
30Jan

### If a car can go from 0.0 to 60.0 mi/hr in 8.0 seconds, what would be its final speed after 5.0 seconds if its starting speed were 50.0 mi/hr?

anjumanasya608 Physics 1 0
30Jan

### Waves that move matter back and forth are called                 a.transverse waves  b.longitudinal wave     c. Medium wave

kioshimaru Physics 2 0
30Jan

### A wave with a large amplitude has a lot of             a.vibration  b.speed   c.energy

kioshimaru Physics 1 0
30Jan

emik Physics 1 0
30Jan

### You are planning a trip to Singapore. Your travel agent gives you the proper transformer to step down the voltage so you can use your electric appliances there. Curious, you open the case and find that the primary coil has 46 turns and the secondary has 24 turns. Assuming the output voltage is 120 volts, what is the standard household voltage in Singapore?

Yamid Physics 1 0
30Jan

### How much voltage would be necessary to generate 10 amps of current in a circuit that has 5 ohms of resistance?

Poenggol Physics 1 0
30Jan

### How can friction be reduced when it is a problem

Skypuppy10 Physics 1 0
30Jan

### An ambulance is traveling east at 51.6 m/s. Behind it there is a car traveling along the same direction at 32.3 m/s. The ambulance driver hears his siren at a frequency of 615 Hz. 32.3 m/s Car 51.6 m/s Ambulance What is the wavelength of the sound of the ambulance’s siren if you are standing at the position of the car? The velocity of sound in air is 343 m/s . Answer in units of m

yokeirytavarez Physics 1 1
30Jan

### A child sits two meters from the center of a merry-go-round. How far does she travel during one revolution?

JuneMalafronte Physics 1 0
30Jan

Tmb Physics 1 0
30Jan

### You want to describe the harmonic motion of a swing. You find out that it take 2 seconds for the swing to complete one cycle. What is the swing’s period and frequency?

IsabelleIseman404 Physics 1 0
30Jan

### Compare the intensity of light 2 meters away from a lit match to the intensity 6 meters away from the match.

kasibb Physics 1 0
30Jan

### A cannonball is launched with a speed of 170 m/s at 40 degrees above the horizontal. Find the missing components into which is the resolved. Thank you in advanced!

deanchen1234 Physics 1 0
30Jan

### A liquid with a specific heat of 1,900 J/kg·°C has 4,750 joules of heat energy is added to it. If the temperature increases from 20°C to 30°C, what is the mass of the liquid?

katelyn23696 Physics 1 4
30Jan

### A circuit contains two 1.5 volt batteries and a bulb with a resistance of 3 ohms. Calculate the current.

Crazy107 Physics 1 0
30Jan

### A 0.28 kg piece of glass is heated from 303 K to 333 K. How much heat had to be transferred to the glass? (specific heat to glass = 664 J/kg K)

Raschke618 Physics 1 0
30Jan

### A compass is a magnet and Earth is a magnet. How does the magnetism of a compass work with the magnetism of Earth so that a compass is a useful tool for navigating?

twinaliyah Physics 1 0
30Jan

### A 10-meter long ramp has a mechanical advantage of 5. What is the height of the ramp?

Leshloveschoc Physics 1 0
30Jan

### A helicopter’s speed increases from 25 m/sec to 60 m/sec in 5 seconds. What is the acceleration of this helicopter?

deemock Physics 1 0
30Jan

### What is the potential energy of a 2-kilogram potted plant that is on a 1 meter-high plant stand?

branhamish Physics 1 0