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1. An object is initially moving with a speed of 10.0 m/s in the direction 60.0 degrees N of E. Ten seconds later, the object is moving with a speed of 20.0 m/s in the direction 30.0 degrees S of E.
(a) What is the acceleration of the object in unit vector notation?
(b) What is the magnitude and direction of the displacement of the object during the ten second interval?
A 80 kg man is ice-skating due north with a velocity of 6.0 m/s when he collides with a 35 kg child. find the magnitude of the child's velocity just before the collision
A girl is sledding down a slope that is inclined at 30º with respect to the horizontal, The combined mass of the girl and the sled is 76.5 kg, How much time is required for the sled to travel down a 149-m slope, starting from rest
A softball of mass 0.220 kg that is moving with a speed of 5.5 m/s (in the positive direction) collides head-on and elastically with another ball initially at rest. calcultae the velocity of the target ball after the collision
n object is projected from the surface of the earth with a speed of 1.98×104 m/s. What is its speed when it is very far from the earth
assume a bar 2 m long expands 0.6 cm when heated. By how much will a bar 100 m long of the same material expand when similarly heated.
Two narrow slits separated by 0.51 mm are illuminated by monochromatic light of wavelength 670 nm. How many bright fringes can be seen on a screen 1.3 cm wide placed 1.1 m in front of the slits.
An electron accelerated from rest through a voltage of 350V enters a region of constant magnetic field. If the electron follows a circular path with a radius of 28cm, what is the magnitude of magnetic field.
Calculate the net impulse delivered to a 138-kg quarterback initally running at 4.5 m/s if he's hit by a defending player and slowed to a speed of 1.1 m/s
On planet Tehar, the free-fall acceleration is the identical as that on Earth, but there is also a strong downward electric field that is uniform close to the planet's surface.
A horse is capable of moving at four different speeds: walk (1.9 m/s), trot (5.0 m/s), canter (7.0 m/s), and gallop (12 m/s). Ann is learning how to ride a horse. She spends 15 minutes riding at a walk and 1.8 minutes at each other speed.
In a Mass Spectrometer, ions of a precisely selected speed are sent into a uniform magnetic field where they move along a semicircle, What is the mass of the ion
How much work is needed to push a 132- kg packing crate a distance of 2.35 m up an inclined plane that makes an angle of 26 o with the horizontal, when inclined plane is frictionless
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