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April 16, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
b h
Tuesday, March 4, 2014 at 7:33pm

Physics -- check answers please (new)
Oh, and we disagree on 6
Tuesday, March 4, 2014 at 7:29pm

Physics -- check answers please (new)
1 c right 2 b right
Tuesday, March 4, 2014 at 7:28pm

Physics -- check answers please
you did not list them so I do not know what c and b are 6. If I add heat it will get hot I think, unless I subtract more heat :)
Tuesday, March 4, 2014 at 7:27pm

Physics
h = 0.5g*t^2 = 4.9*2^2 = 19.6 m.
Tuesday, March 4, 2014 at 7:18pm

physics
5
Tuesday, March 4, 2014 at 7:08pm

Physics -- check answers please (new)
1. Which of the following best shows the transfer of heat by radiation? a) the hot sand in very painful to step on with bare feet b)the soup pot boils from the bottom towards the top c)the wood stove is painted a flat black colour for maximum heating effect d)the use of fossil...
Tuesday, March 4, 2014 at 6:59pm

Physics -- check answers please
1. Which of the following best shows the transfer of heat by radiation? my answer: c 2. Which of the following best shows the transfer of heat by convection? my answer: b 3. Water has specific heat of 4200 J per kilogram per degree celsius. This means that 2 kg of water will ...
Tuesday, March 4, 2014 at 6:57pm

Physics
Three astronauts, propelled by jet backpacks, push and guide a 149 kg asteroid toward a processing dock, exerting the forces shown in the figure, with F1 = 28 N, F2 = 59 N, F3 = 41 N, θ1 = 30°, and θ3 = 60°. What is the (a) magnitude and (b) angle (measured ...
Tuesday, March 4, 2014 at 6:34pm

Physics
Obviously, energy cannot be conserved, so working with momentum... + direction away from her.. -300*2.30+22.5*39.5=300*0+22.5V solve for V
Tuesday, March 4, 2014 at 5:42pm

Physics
A knife thrower throws a knife toward a 300-g target that is sliding in her direction at a speed of 2.30 m/s on a horizontal frictionless surface. She throws a 22.5-g knife at the target with a speed of 39.5 m/s. The target is stopped by the impact and the knife passes through...
Tuesday, March 4, 2014 at 5:09pm

Physics
Daddy
Tuesday, March 4, 2014 at 2:28pm

Physics
A 2 kg ball is rolled down a hill 25 m tall. When it reaches the bottom of the hill it is traveling at 15.1 m/s. How much energy was dissipated due to friction?
Tuesday, March 4, 2014 at 1:10pm

Physics
ignore this question
Tuesday, March 4, 2014 at 1:01pm

physics
d
Tuesday, March 4, 2014 at 12:12pm

Physics
A 500 kg go-cart is traveling at 15 m/s when the driver slams on the brakes. The cart comes to a stop in 7 m. If the same braking force is applied, how far will the cart travel after braking if it were traveling at 32 m/s?
Tuesday, March 4, 2014 at 11:58am

Physics
A person is travelling 6 km (E) then 4 km (N) and finally 2 km (W). Calculate the average speed And velocity. Show your work
Tuesday, March 4, 2014 at 11:32am

Physics
(1/2) m v^2 = 1.6*10^4 32 v^2 = 160 * 10^2 v^2 = 5 * 10^2 v = 10 sqrt 5 or about 22.4 m/s 22.4 m/s *3600 s/h * 1 km/1000 m = 80.5 km/h
Tuesday, March 4, 2014 at 10:28am

physics
If the helicopter accelerates at 1 m/s^2 then the bananas accelerate at 1 m/s^2 unless the string breaks.
Tuesday, March 4, 2014 at 10:24am

physics
A Helicopter lifts a Gorrila With Weight 50000kg on String a and on String B a Bunch of Bananas Mass 2000kg , Calculate the Acceleration of the Bunch of Bananas. The helicopter accelerates upwards 1m.s^-2
Tuesday, March 4, 2014 at 10:04am

Physics
A 64 kg student traveling in a car with a constant velocity has a kinetic energy of 1.6 10^4 J. What is the speedometer reading of the car in km/h?
Tuesday, March 4, 2014 at 9:42am

Physics
I don't !@#$%^&imh know.
Tuesday, March 4, 2014 at 9:18am

Physics
average speed during stop = 15/2 = 7.5m/s time to stop = 7 m / 7.5 m/s = .933 s a = -15/.933 = -16.1 m/s^2 F = m a = 500(-16.1) = -8036 N a = same a = -16.1 v = Vi + a t 0 = 32 -16.1 t t = 32/16.1 = 1.99 s d = Vi t + (1/2)at^2 = 32(1.99) - 8(4) = 32 m d = Vi t - (16.1/2)t^2
Tuesday, March 4, 2014 at 6:26am

physics
11) Three point charges of magnitudes +6.0 mC, -7.0 mC, and -13 mC are placed on the x-axis at x = 0 cm, x = 40 cm, and x = 120 cm, respectively. What is the force on the -13 mC charge due to the other two charges? A) -0.55 N B) -0.79 N C) 0.55 N D) 0.79 N
Tuesday, March 4, 2014 at 1:49am

Physics
The coefficient of static friction between the m = 3.20-kg crate and the 35.0° incline of the figure below is 0.260. What minimum force vector F must be applied to the crate perpendicular to the incline to prevent the crate from sliding down the incline?
Tuesday, March 4, 2014 at 1:13am

Physics
1.87
Monday, March 3, 2014 at 11:50pm

Physics
Two charges repel each other with a force of 10-6N when they are 10cm apart. when they are brought closer together until they are 2cm apart the force between them becomes?
Monday, March 3, 2014 at 11:46pm

physics
a rock with a mass of 2 kg is thrown from the top of a cliff 75 m high with a velocity of 10m/s. how much Kinetic energy does it have when it gets to the bottom?
Monday, March 3, 2014 at 11:28pm

physics
A 500 kg go-cart is traveling at 15 m/s when the driver slams on the brakes. The cart comes to a stop in 7 m. If the same braking force is applied, how far will the cart travel after braking if it were traveling at 32 m/s?
Monday, March 3, 2014 at 11:06pm

physics
Two skaters with masses of 66kg and 47kg , respectively, stand 5.5m apart, each holding one end of a piece of rope. Part A If they pull themselves along the rope until they meet, how far does each skater travel? (Neglect friction.) Part B If only the 47kg skater pulls along ...
Monday, March 3, 2014 at 10:51pm

physics
Find the center of mass of a system composed of three spherical objects with masses of 3.0kg , 1.6kg , and 4.3kg and centers located at (-6.7m , 0), (1.0m , 0), and (2.7m , 0), respectively. Express your answers using two significant figures separated by a comma. xCM, yCM
Monday, March 3, 2014 at 10:49pm

physics
A 4.4kg ball with a velocity of 4.6m/s in the +x-direction collides head-on elastically with a stationary 2.1kg ball. Part A What is the speed of the first ball after the collision? Part B What is the direction of the velocity of the first ball after the collision? What is the...
Monday, March 3, 2014 at 10:47pm

physics
A cherry bomb explodes into three pieces of equal mass. One piece has an initial velocity of 12m/sx^. Another piece has an initial velocity of 7.0m/sx^−5.0m/sy^. Part A What is the velocity of the third piece? Enter the x and y components of the velocity separated by a ...
Monday, March 3, 2014 at 10:44pm

physics
A 16g bullet moving horizontally at 400 m/s penetrates a 3.2kg wood block resting on a horizontal surface.(Figure 1) Part A If the bullet slows down to 300 m/s after emerging from the block, what is the speed of the block immediately after the bullet emerges?
Monday, March 3, 2014 at 10:43pm

Physics
COULD I GET SOME HELP?
Monday, March 3, 2014 at 10:30pm

physics
an unpolarised light is incident on the boundary between two transparent media. State the contition when the reflected wave is totally plane polarised.
Monday, March 3, 2014 at 9:20pm

Physics
A 500 kg go-cart is traveling at 15 m/s when the driver slams on the brakes. The cart comes to a stop in 7 m. If the same braking force is applied, how far will the cart travel after braking if it were traveling at 32 m/s?
Monday, March 3, 2014 at 9:08pm

physics
A 45 kg boy is holding a 12 kg pumpkin while standing on ice skates on a smooth frozen pond. The boy tosses the pumpkin with a horizontal speed of 2.8 m/s towards a 37 kg girl who catches it. The girl is also wearing ice skates. What are the final speeds of the boy and the girl?
Monday, March 3, 2014 at 8:58pm

Physics
At the top of an inclined track, a spring is attached to a rod at one end and a dynamics cart at the other such that the spring stretches parallel to the track. The cart has a mass of .850kg and there is negligible friction between the cart and the track. The spring has a ...
Monday, March 3, 2014 at 8:52pm

Physics
A spring of unknown force constant is attached to a rod so that it hangs vertically. With no mass attached, the spring has a length of 12.0 cm. When a student attaches a mass of 50 grams, the spring stretches to a length of 18.0cm. Determine the force constant for this spring.
Monday, March 3, 2014 at 8:51pm

Physics
A dynamics cart with a friction pad is placed at the top of an inclined track and released from rest. The cart accelerates down the incline at a rate of .60m/s^2. If the track is angled at 10 degrees above the horizontal, determine the coefficient of kinetic friction between ...
Monday, March 3, 2014 at 8:50pm

Physics
A baseball player rounds third base and is heading for home when he is signaled by the base coach to slide. The player has a speed of 3.5m/s when he begins to slide and he travels through a linear distance of 1.50 meters before coming to rest. Determine the coefficient of ...
Monday, March 3, 2014 at 8:48pm

physics
A uranium nucleus (mass 238 u), initially at rest, undergoes radioactive decay. After an alpha particle (mass 4.0 u) is emitted, the remaining nucleus is thorium (mass 234 u). If the alpha particle is moving at 0.055 the speed of light, what is the recoil speed of the thorium ...
Monday, March 3, 2014 at 8:47pm

Physics
1 - .92 = .08 left PE = m g h PE2/PE1 = 1.21/1.45 = .8345 .8345^n = .08 n log .8345 = log .08 n = 13.96 or about 14
Monday, March 3, 2014 at 8:37pm

Physics
Approximatley three
Monday, March 3, 2014 at 8:34pm

Physics
A ball is dropped from a height of 1.45m and rebounds to a height of 1.21m. Approximately how many rebounds will the ball make before losing 92% of its energy?
Monday, March 3, 2014 at 8:30pm

physics
The answer is 2.03 N using anonymous post and puling in the number. They repel each other because they have the like charges.
Monday, March 3, 2014 at 7:50pm

Physics
F * 4 = 56 F = 56/4 = 14 N
Monday, March 3, 2014 at 7:41pm

Physics -- check answers please
I agree with all six
Monday, March 3, 2014 at 7:41pm

physics
29
Monday, March 3, 2014 at 7:35pm

Physics
It takes 56 J to push a block 4 m. If the force is in the same direction as the displacement, what is the force on the block?
Monday, March 3, 2014 at 7:04pm

Physics -- check answers please
1. what is 67 K equivalent to in Celsius? answer: -206.15 C 2. what is 458.9 Celsius in K? answer: 732.05 3. heat is closely related to: a)temperature b)thermal energy c)force d)convection currents answer: b 4. What does a low efficiency score reveal about a home in terms of ...
Monday, March 3, 2014 at 7:04pm

Physics
TME=Eg+Ek+Eel TME=mgh+1/2 m v^2 +0 you know m, h, g, v
Monday, March 3, 2014 at 6:42pm

Physics
m g h + (1/2) m v^2
Monday, March 3, 2014 at 6:37pm

Physics
A 6 kg brick is falling at a rate of 48.9 m/s toward the earth at a current height of 14 m. What is the total mechanical energy of the brick? (total mechanical energy= Eg+Ek+Eel) What is the answer in Joules?
Monday, March 3, 2014 at 6:33pm

Physics
A 6 kg brick is falling at a rate of 48.9 m/s toward the earth at a current height of 14 m. What is the total mechanical energy of the brick? (total mechanical energy= Eg+Ek+Eel) What is the answer in Joules?
Monday, March 3, 2014 at 6:12pm

Physics
three masses m .18 m and m - .18 m = .82 m ----------------------- momentum = m Va forever so m Va = .82 m (0) + .18 m (v) v is relative to ground or Va = .18 v throw speed relative to moving cart = v - Va = .82 v v = Va/.18 = 5.56 Va new speed of baggage relative to ground = ...
Monday, March 3, 2014 at 5:53pm

Physics 1 (college)
I dont understand where you got .1 and then -1 from. Can you explain that?
Monday, March 3, 2014 at 5:49pm

Physics
A baggage cart full of luggage is coasting at a speed vA across the airport taxiway. When eighteen percent of the mass of the cart and luggage is thrown off the cart, parallel to the ground and in the forward direction, the cart is brought to a halt. If the direction in which ...
Monday, March 3, 2014 at 5:17pm

physics
fbgf
Monday, March 3, 2014 at 5:15pm

physics
On Jupiter 2900 * 2.53 or 2900 * 380.150 which is the same neptune 2900 * 1.18
Monday, March 3, 2014 at 4:35pm

Physics
at rest so no net force force down plane = m g sin T force up plane = mu m g cos T so m g sin T = mu m g cos T so mu = tan T if friction just holds it
Monday, March 3, 2014 at 4:32pm

Physics
If it is at rest plane angle T from horizontal force down plane = m g sin T force up plane = mu m g cos T no acceleration so mu m g cos T = m g sin T or mu = tan T
Monday, March 3, 2014 at 3:55pm

Physics
The lower half of an inclined plane is rough the upper half being smooth a particle is allowed to slide from the top and is brought to rest by friction just as it reaches the bottom, find the ratio of the force of friction to the weight of the particle intermes of the ...
Monday, March 3, 2014 at 3:50pm

physics
Hey, all these questions are really the same. I think you can do them now.
Monday, March 3, 2014 at 3:45pm

physics
m g where g is 6.5 m/s^2
Monday, March 3, 2014 at 3:45pm

physics
m g' at this altitude = 850 so g' = 850/470 = 1.81 m/s^2 we are way out there! 1.81/9.81 = Rearth^2/r^2 Re^2 = 6370000^2 = (6.37*10^6)^2 =40.6*10^12 so r^2 = 9.81 * 40.6*10^12 /1.81 r^2 = 220 * 10^12 r = 14.8 * 10^6 meters = 14,800 km r - Re = altitude = 8,430 km
Monday, March 3, 2014 at 3:44pm

physics
7
Monday, March 3, 2014 at 3:35pm

physics
16 times 60 Hey, this is getting old
Monday, March 3, 2014 at 3:33pm

physics
if they were 1/5 as far apart? 25 times 45 same old 1/r^2
Monday, March 3, 2014 at 3:32pm

physics
The rest is just to confuse the student by the way.
Monday, March 3, 2014 at 3:29pm

physics
F = G Mm /R^2 F' = G M m /(1.2R)^2 = G M m /R^2 * 1/1.44 9.81 * 1/1.44 = 6.81 m/s^2
Monday, March 3, 2014 at 3:29pm

Physics
The lower half of an inclined plane is rough the upper half being smooth a particle is allowed to slide from the top and is brought to rest by friction just as it reaches the bottom, find the ratio of the force of friction to the weight of the particle intermes of the ...
Monday, March 3, 2014 at 3:20pm

Physics
If you find out please tell me. I like meters, kilograms, seconds
Monday, March 3, 2014 at 3:17pm

Physics
m g h = 20 2 * 9.81 * h = 20 h = 1.02 meter rounding to 1 meter
Monday, March 3, 2014 at 3:16pm

physics
An astronaut in full gear has a weight of 2900 N on Earth. Jupiter; weight on planet relative to earth is 2.53 and weight of a 150-lb person is 380. How much will the astronaut weigh on the Jupiter? W_{Jupiter} =________________ N Neptune; weight on planet relative to earth ...
Monday, March 3, 2014 at 3:11pm

physics
A planet has a radius of about 0.85 times Earth's radius and a mass of only 0.74 times Earth's mass. Estimate the acceleration due to gravity on the planet. Use M_{Earth} = 5.972 x 10^{24} kilograms and r_{Earth} = 6370 kilometers a_{planet} = ________________{m}/{s^2...
Monday, March 3, 2014 at 3:03pm

physics
The acceleration due to gravity on a certain planet is about 6.5 \frac{m}{s^2}. What would a 78-kg scientific instrument weigh on Titan? W_{instrument} =______________ N (no rounding up)
Monday, March 3, 2014 at 3:02pm

physics
A 470-kg satellite experiences a gravitational force of 850 N. Use M_{Earth} = 5.972 x 10^{24} kilograms and r_{Earth} = 6370 kilometers What is the radius of the satellite�s orbit? r_{orbit} = _____________kilometers What is its altitude? altitude = ...
Monday, March 3, 2014 at 3:01pm

physics
The gravitational force between two metal spheres with the same masses are in outer space is 60 N. How large would this force be if the masses of each sphere were cut to a fourth of its original value? F_{attractive} =_____________ N (no rounding up)
Monday, March 3, 2014 at 2:59pm

physics
Two spacecraft in outer space attract each other with a force of 45 N. What would the attractive force be if they were \frac{1}{5} as far apart? F_{attractive} = _____________N (no rounding up)
Monday, March 3, 2014 at 2:58pm

physics
What is the acceleration due to gravity at a distance of 1.2 Earth radii above Earth�s surface? Use M_{Earth} = 5.972 x 10^{24} kilograms and r_{Earth} = 6370 km a_{gravity} =______________{m}{s^2}
Monday, March 3, 2014 at 2:54pm

Physics
Can I know what is the 10 benefits of using different units of measurements?
Monday, March 3, 2014 at 2:49pm

Physics
The mass on a pendulum is given 20 J of potential energy. If the mass is 2 kg, how high, in meters, was it raised? Please round your answer to the nearest whole number and use g = 10 m/s2
Monday, March 3, 2014 at 2:49pm

physics
Work = F*d = 2 * 0 = 0
Monday, March 3, 2014 at 2:40pm

physics
d = r*t = 3 m. r * 0.3 = 3 r = 10 m/s. = Rate of speed.
Monday, March 3, 2014 at 2:29pm

English
Momentum is product of mass and velocity. At the same speed, the heavier object will have more momentum. I think this is Physics, not English, by the way.
Monday, March 3, 2014 at 2:14pm

Physics
on earth I assume weight = 850 * 9.81 in Newtons
Monday, March 3, 2014 at 1:55pm

Physics
Determine the force of gravity on an 850 kg car.
Monday, March 3, 2014 at 12:49pm

Physics
a
Monday, March 3, 2014 at 12:45pm

physics
a truck of mass 8500Kg is pulling a trailer of mass 27 000Kg on a level road.The coefficient of kinetic friction is 0,20.A horizontal force of 75 000N moves the truck forward.question:calculate the magnitude of the acceleration of the system
Monday, March 3, 2014 at 10:40am

physics
A 25.5- kg block (m1) is on a horizontal surface, connected to a 5.7- kg block (m2) by a massless string as shown in the Figure. The pulley is massless and frictionless. A force of 239.3 acts on m1 at an angle of 32.1 . The coefficient of kinetic friction between m1 and the ...
Monday, March 3, 2014 at 9:53am

Physics
A plane flying in a straight line at constant altitude of 2000 m above the ground with a speed of 200m/s drops an object. Explain how the velocity of the object is actually affected by air resistance. Show how the resistivity force of air and velocity of the object varies with...
Monday, March 3, 2014 at 7:28am

physics 1
a. for the slower planet, start with speed and period to get radius. speed=2PI r/period solve for r then centripet force = gravitational force mv^2/r=GMm/r^2 solve for M
Monday, March 3, 2014 at 6:38am

physics 1
consider cetnripetal acceleration =graviational v1^2/(re+418) = g*(re/(re+418))^2 solve for v1, then do the same for v2
Monday, March 3, 2014 at 6:35am

Physics
none, since there was no change in height.
Monday, March 3, 2014 at 5:30am

physics 1
Two satellites are in circular orbits around the earth. The orbit for satellite A is at a height of 418 km above the earth’s surface, while that for satellite B is at a height of 731 km. Find the orbital speed for (a) satellite A and (b) satellite B.
Monday, March 3, 2014 at 3:43am

physics 1
Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. The orbital speeds of the planets are determined to be 43.6 km/s and 63.5 km/s. The slower planet's orbital period is 8.36 years. (a) What is the mass of the star? (b) What ...
Monday, March 3, 2014 at 3:26am

Physics
If I carry a 27 kg bag horizontally across the floor a distance of 14 m. How much work did the FORCE OF GRAVITY do on the bag?
Monday, March 3, 2014 at 12:05am

physics
The spring constant of the spring in the figure is 25 N/m, and the mass of the object is 4 kg. The spring is unstretched and the surface is frictionless. A constant 18 N force is applied horizontally to the object (stretching the spring). v0 = 0 Find the speed of the ...
Sunday, March 2, 2014 at 11:17pm

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