# physics please HELP !

74,851 results, page 69-
## Physics

Q1:Find the phase and group velocities of the de Broglie waves of an electron whose kinetic energy is 500kev? -
## physics

How much current is drawn by a television with a resistance of 21 that is connected across a potential difference of 120 V? 5.45A wasn't right -
## 12th grade Physics

how much tension must a rope withstand if it is used to accelerate a 1200-kg car vertically upward at .80 m/s^2? -
## Basic Physics

I don't understand how to work this problem out: Find x-component of vector a ⃗ = (7.0m/s 2 , - y-direction) Please help -
## physics

Determine the magnitude of the force of gravity acting on a 340 kg satellite, 850 km above Earth's surface -
## physics

A 50 kg diver leaps off the 20 meter diving board with a velocity of 5 m/s. What is his kinetic energy just before hitting the water? -
## physics

A bus accelerates at 1.4 m/s2 from rest for 14 s. It then travels at constant speed for 23 s, after which it slows to a stop with an acceleration of magnitude 1.3 m/s2. -
## physics

A longjumper running at 12 m/s and jumps at 20 degrees. No wind or resistance but gravity is normal -9.81 m/s2. How far will person jump? -
## Physics

A weightlifter raises a 90k-g barbell from the floor to a height of 2/2 m in 0.6 s. What was his average power output during the life? -
## Physics

A tennis ball is thrown with a velocity of 30m/s at an angle of 60^ of the horizontal calculate the time,m/s,and the range -
## physics

estimate the rotational kinetic energy of earth, assuming it to be a solid sphere of uniform density -
## physics

How far to the nearest meter can a sprinter running at 9 m/s, travel in the time it takes a rock to fall 65 meters? -
## Physics

A bouncing ball returns to the same height each time. Is this an example of simple harmonic motion? Explain your answer. -
## Physics

Some hydrogen occupies 120 ft at 60.0°F. Find the temperature when its volume is 132ft^3 if the pressure remains constant. -
## physics

a body is thrown vetically up from the ground passes the height 10.2 m twice at an interval of 10s .what was initial velocity? -
## Physics

What is the frequency shift of a 79 GHz police radar signal when it reflects off a car moving at 110km/h ? -
## PHYSICS

A CAR TRAVELLING AT 30M/S Overcome A FrictionAlly Resistance Of 100N While Moving.What Is The Power Of The Engine(Take 1 Hp=3/4 Kw) -
## physics

For an object travelling at a constant velocity,what quantity of motion remains the same over equal time interval? -
## physics

If an object is hung from a cable with a weight of 40 N, what is the tension in the two cables? I got T1=21.23N and T2=18.77 but I don't know if I am doing these problems correctly... -
## Physics

What minimum speed does a 100 g puck need to make it to the top of a 5.9 m-long, 29 degree frictionless ramp? -
## physics

is increasing the current a valid method to increase the induced voltage when a magnet moves into a solenoid? -
## Physics

What is the magnitude of the average force required to stop an 1500 kg car in 8.0 s if the care is traveling at 95 km/h? Sum of F = ma? -
## physics

a particles is moving in the circle of the daimeter 5 cm. calculate the distance coverd and the displacement when it covers 3 revolution -
## Physics

Determine the tension in a 40 cm long pendulum when a bob of mass 200g moving at 0.7 m.s is 15 degrees from the vertical? -
## Physics. PLEASE HELP!!

When a 0.35 kg baseball is hit, its velocitychanges from 21 m/s to -29.5 m/s. What is the magnitude of the impulse de-livered by the bat to the ball? Answer in units of N · s -
## Physics

a 60 gram tennis ball completed 5 revolutions in 1.68 seconds. given that the radius was 35 centimeters, what haning mass was used -
## physics

If a person does 80 J of work in moving a 30 \rm{kg} box over a 13 m distance on a horizontal surface, what is the minimum force required? -
## physics

a pendulum of length L=9.8m hangs in equilibrium and is given velocoity v=0.2m/s at its lowest point.What is the magnitude of the subsequent oscillation? -
## physics

An airplane accelerates down a runway at 3.33 m/s2 for 35.3 s until is finally lifts off the ground. Determine the distance traveled before takeoff. -
## physics

A cylindrical glass is 15cm long its diameter is 7cm. what volume of milk can be poured in it without spilling -
## physics calc based

In the product F = qB (vectors), take q = 2 (neglecting the units of charge, q) and v = 2.0 i + 4.0 j + 6.0 k and F = 4.0 i + (-20 j) + 12 k . What then is B in unit-vector notation if Bx=By ? -
## physics

okay a race car's velocity increases from 4 m/s to 36 m/s over a 4 s time innterval, its average acceleration would be 10 m/s 2 ? would this question be true ? -
## PHYSICS

A cell phone emits signs in approximately 750 Mhz. Which is the wavelength and energy of this radiation -
## physics

A light bulb with resistance of _____________ Omega draws 900 mA from a 110 V household circuit. -
## physics

How large a force (in newtons) is needed to accelerate a 3 metric-ton vehicle from rest to a speed of 50 km/hr in 4 s? -
## physics

Find the angular speed of the Earth as it spins about its axis. Give your result in rad/ses -
## physics

two charged objects carry a negative charge of 2*10c. calculate their distance apart if the force between them is 10n -
## physics

A _____________ volt battery will increase the potential energy of 0.005 coulombs of charge by 29.5 joules. -
## physics

an object is 25 cm from a concave mirror whose focal length is 50 cm where will the image be located how wil lthe solution be ? -
## Physics

A ball thrown into the air lands on the same horizontal level, 31 m away, and 2.65 s later. Find the magnitude of the initial velocity. -
## Physics

How fast must a truck travel to stay beneath an airplane that is moving 139km/hr at an angle of 25° to the ground? -
## Physics/ Chem

Find the entropy change when 51g of steam condenses to water at 100 ∘C. -
## physics

Determine the magnitude of the force of gravity acting on a 340 kg satellite , 850 km above Earth's surface. -
## Physics

A ball is thrown vertically upward with a velocity of 30m/s. Determine the maximum height reached -
## physics

a ball rolling down a hill uniformly accelerated at 4 m/s2. assumong that it start from rest, what is its speed at the end of each of the first 3 s? -
## Physics

the current in an rc circuit if the resistance is 20 ohms the capacitance is 0.002 farad the emr is 12e^-10t -
## physics

for an RLC circuit with a resistance of 11 k*ohm, a capacitance of 2 uF, and an inductance of 24 H, what frequency is needed to minimize the impedance? -
## physics

if a train travell at speed of 90km/hour. and when the break applied at 5m/sec2. how much it will travel before stoping -
## physics

the current to an LC circuit is being supplied according to the function I(t)=2*sin(7t). what is the smallest value of t for which the inductor and capacitor each contain half of the energy? -
## Physics.

An electron in a hydrogen atom is revolving around the proton in a orbit of radius r and velocity v .find the current. -
## physics

when you do work to push an object horizonatally on a frictionless surface what energey change is taking place? -
## physics

Beats in sound are the result of which of the follwing wave? A) resonance.B) refraction.C) reflections.D) amplitude changes.E) interference -
## physics

At highway speed, a particular car is capable of an acceleration of about 1.7m/s^2.At this rate how long does it take to accelerate from 90 km/h to 110 km/h? (in seconds) -
## Physics

As the passenger cars are launched from rest at the start, they are accelerated uniformly to a speed of 57 m's (128 mph) in just 3.5 s. -
## physics

m1=4kg and m2=2kg and angle is 42 degrees.if the mass m2 is moving down with 0.5 m/s^2 acceleration, find the coefficient of the friction -
## physics

What is the strength of the magnetic field a distance of 1 meter from a wire carrying a current of 1 A? equation: B=MoI ------ 2(pi)r Mo=4(pi)x 10^-7 I=1 A How do I know what r is? -
## Physics

A satellite that is 4175 miles from the center of the earth, orbits with a period of 90 minutes. What is its centripetal acceleration? -
## Physics

What equation illustrates the relationship between the electric field strength and the potential difference? E = d / v E = v / d d = E(v) E = v(d) I'm honestly clueless on this one -
## physics

Mitch carries a large cat from one end of his bedroom to the other.does he do any work?if not why? if so,what energy change is occurring? -
## Physics

A rock is thrown upward at 65.2 ◦ with respect to the horizontal. As it rises, its vertical component of velocity -
## physics

A violin string vibrates at 440 Hz when unfingered. At what frequency will it vibrate if it is fingered one fourth of the way down from the end? -
## Physics

How do I find Vector Resolution F = 0.300 g N, theta = 60 degrees. Do I take tan inverse (.3 sin 60/.3 cos 60)? -
## physics

The quality of a musical tone has to do with a variety of which of the following? A) amplitudes.B) sound speeds.C) intensities.D) decibels.E) harmonics. -
## physics

what force is being applied to a meteor with a mass of 500 kg as it travels at a constant velocity of 5000 meters per second? -
## physics

What is the radial acceleration of an object at a point 25 meters from the axis of rotation that has a radius and a period of .22 seconds? -
## Physics

I don't understand what formula to use for this question: Points A and B each have an electric potential of +9 V. How much work is required to take 1 mC of charge from A to B? Thank you -
## physics

An automobile starts from rest and 110 ft attains a speed of 30 mi/h. In what time has it traveled this distance and the is the acceleration? -
## college physics

Let's say that you find a slope of 6.671×10-14 for square plates of width 11.5 cm. What do you get for the value of the permittivity of free space? -
## Physics

A satellite orbits at an average altitude of h = 409 km. What is its orbital speed? Use REarth = 6370 km and mEarth = 5.98 x 10^24 kg -
## physics

what is the acceleration of a point on the time of a flywheel 0.90 m in diameter, turning at the rate of 1200 rev/min? -
## Physics

is the mechanical energy of a teflon coated block sliding down a rough incline remaining constant? -
## Physics

Describe the path of a moving body whose acceleration is constant in magnitude at all times and is perpendicular to the velocity. -
## Physics

A grenade is thrown up into the air with an initial velocity of 27 m/s. How long does it take to return to the thrower's hand? I got 5.4 s, but I am very unsure. -
## Physics

An FM radio station of frequency 107.7MHz puts out a signal of 50,000W. How many photons/s are emitted? -
## physics

3 points particles with masses 4kg,2kg,3kg are at the corners of equilateral triangle of side m =2m. -
## Physics

Eight books, each 4.1 cm thick with mass 1.8 kg, lie flat on a table. How much work is required to stack them one on top of another? -
## Physics

a 10-kg bos slides down a frictionless ramp with acceleration 3.6 m/s calculate the weight....the angle and normal force -
## Physics

A golf ball is chipped at an angle of 37 degrees and with a speed of 13.5 m/s. How far does it travel to the nearest tenth of a meter? -
## physics (Simple harmonic motion)

X(t)=0.142sin(2t+0.19) b) Find the travelled distance by block at t2=3.5min [37.963m]. -
## Physics Help!

Find the total kinetic energy content of 1.55 moles of an ideal gas at temperature 435 K -
## Physics

a 10-kg bos slides down a frictionless ramp with acceleration 3.6 m/s calculate the weight....the angle and normal force -
## physics

State the surface powers required to produce the following lenses with +6.25D front curves. a. -0.50 DS b. +0.50 DS c. +1.75 DS Is a -6.75DS?.... -
## physics

a race car's velocity increases from 4 m/s time interval, its average acceleration would be 10 m/s2 ? true or false ? -
## physics

I need to make a holder for a raw egg out of straws so when it is dropped from 8 feet. it will not break I need design ideas. -
## Physics

Vector A has magnitude 37 units and direction, counterclockwise from east, of 12.9 degrees. What is the value of its x component to 1 decimal place? -
## physics

a 1000 kg sports car accelerates from 0-30 m/s in 5.0 s. What is tge average power delivered by the automobile engine? -
## physics

A grenade thrown straight up in the air has an initial speed of 27 m/s. How long will it take before it returns to the thrower's hand? -
## Physics

Given a free falling object that is initially at rest, what are the objects displacement, velocity, and acceleration after 9 seconds? -
## Physics

lightning strikes a tower 4 km away. how long after the strike will you hear the thunder? the speed of sound is 344 m/s -
## physics

dave is traveling in his car at 16m/s. he maintains this speed for 60 seconds. what is his acceleration in meters per second squared? -
## Physics

A brick has mass 10kg and dimensions (10*5*20)cm Find the maximum and minimum pressure it can exert on ground -
## Physics

A pan filled with hot food cools from 94°C to 86°C in 2minutes when the room temperaturs is at 20°C .How long will it take to cool from 71°C to 69°C ? -
## Physics

Six charge equal to Q are placed at the corners of regular hexagon of each side x,what is the electric potential at the intersection of the diagonals? -
## physics

please give a me a nice topic for my investigatory project. hope the materials also are easy to gather. thanks alot -
## physics PLEASE I NEED HELP

Wally now lift the box of the floor and put it on a shelf. Does he doing any work? If not why? If so .what energy change is accurring? -
## physics

What is the required resistance of an immersion heater that will increase the temperature of 2.00 kg of water from 10.0°C to 50.0°C in 9.0 min while operating at 120 V? -
## Physics

The earth has a radius of 6380 km and turns around once every 24 hours. What is the average speed of a person resting at the equator? -
## Physics II

A block begins to slide down a ramp after being elevated to an angle of 55 degrees. What is the coefficient of static friction? -
## college physics

A delivery truck travels 10 km north, 18 km east, and 29 km south. What is its final displacement (in km) from the origin? -
## physics

A cube of ice, 28 cm on each side, is melted into a measuring cup. What is the volume of the liquid water? ------cm3